Chất nào dưới đây khi phản ứng với HCl thu được sản phẩm duy nhất là 2-clobutan?

Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions:

The advent of the Internet may be one of the most important technological developments in recent years. Never before have so many people had access to so many different sources of information. For all of the Internet’s advantages, however, people are currently becoming aware of some of its drawbacks and are looking for creative solutions. Among the current problems, which include a general lack of reliability and numerous security concerns, the most crucial is speed. First of all, the Internet has grown very quickly. In 1990, only a few academics had ever heard of the Internet. In 1996, over 50 million people used it. Every year, the number of people with access to the Internet doubles. The rapid growth has been a problem. The computer systems which run the Internet have not been able to keep up with the demand. Also, sometimes, a request for information must pass through many routing computers before the information can be obtained. A request for information made in Paris might have to go through computers in New York, Los Angeles and Tokyo in order to obtain the required information. Consequently, the service is often slow and unpredictable. Service also tends to be worse when the Internet is busiest - during the business day of the Western Hemisphere - which is also when companies need its service the most. Some people are trying to harness the power of networked computers in such a way as to avoid this problem. In 1995, a group of American universities banded together to form what has come to be known as Internet II. Internet II is a smaller, more specialized system intended for academic use. Since it is more specialized, fewer users are allowed access. Consequently, the time required to receive information has decreased. Businesses are beginning to explore a possible analogue to the Internet II. Many businesses are creating their own “Intranets”. These are systems that can only be used by the members of the same company. In theory, fewer users should translate into a faster system. Intranets are very useful for large national and international companies whose branches need to share information. Another benefit of an Intranet is an increased amount of security. Since only company employees have access to the information on the Intranet, their information is protected from competitors. While there is little doubt that the Internet will eventually be a fast and reliable service, industry and the academic community have taken their own steps toward making more practical global networks.  

Question: The word "analogue" in paragraph 5 most nearly means_____.         

Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions:

The advent of the Internet may be one of the most important technological developments in recent years. Never before have so many people had access to so many different sources of information. For all of the Internet’s advantages, however, people are currently becoming aware of some of its drawbacks and are looking for creative solutions. Among the current problems, which include a general lack of reliability and numerous security concerns, the most crucial is speed. First of all, the Internet has grown very quickly. In 1990, only a few academics had ever heard of the Internet. In 1996, over 50 million people used it. Every year, the number of people with access to the Internet doubles. The rapid growth has been a problem. The computer systems which run the Internet have not been able to keep up with the demand. Also, sometimes, a request for information must pass through many routing computers before the information can be obtained. A request for information made in Paris might have to go through computers in New York, Los Angeles and Tokyo in order to obtain the required information. Consequently, the service is often slow and unpredictable. Service also tends to be worse when the Internet is busiest - during the business day of the Western Hemisphere - which is also when companies need its service the most. Some people are trying to harness the power of networked computers in such a way as to avoid this problem. In 1995, a group of American universities banded together to form what has come to be known as Internet II. Internet II is a smaller, more specialized system intended for academic use. Since it is more specialized, fewer users are allowed access. Consequently, the time required to receive information has decreased. Businesses are beginning to explore a possible analogue to the Internet II. Many businesses are creating their own “Intranets”. These are systems that can only be used by the members of the same company. In theory, fewer users should translate into a faster system. Intranets are very useful for large national and international companies whose branches need to share information. Another benefit of an Intranet is an increased amount of security. Since only company employees have access to the information on the Intranet, their information is protected from competitors. While there is little doubt that the Internet will eventually be a fast and reliable service, industry and the academic community have taken their own steps toward making more practical global networks.  

Question: As it can be inferred from the passage, what benefits does Internet II have over the Internet I?         

Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions:

The advent of the Internet may be one of the most important technological developments in recent years. Never before have so many people had access to so many different sources of information. For all of the Internet’s advantages, however, people are currently becoming aware of some of its drawbacks and are looking for creative solutions. Among the current problems, which include a general lack of reliability and numerous security concerns, the most crucial is speed. First of all, the Internet has grown very quickly. In 1990, only a few academics had ever heard of the Internet. In 1996, over 50 million people used it. Every year, the number of people with access to the Internet doubles. The rapid growth has been a problem. The computer systems which run the Internet have not been able to keep up with the demand. Also, sometimes, a request for information must pass through many routing computers before the information can be obtained. A request for information made in Paris might have to go through computers in New York, Los Angeles and Tokyo in order to obtain the required information. Consequently, the service is often slow and unpredictable. Service also tends to be worse when the Internet is busiest - during the business day of the Western Hemisphere - which is also when companies need its service the most. Some people are trying to harness the power of networked computers in such a way as to avoid this problem. In 1995, a group of American universities banded together to form what has come to be known as Internet II. Internet II is a smaller, more specialized system intended for academic use. Since it is more specialized, fewer users are allowed access. Consequently, the time required to receive information has decreased. Businesses are beginning to explore a possible analogue to the Internet II. Many businesses are creating their own “Intranets”. These are systems that can only be used by the members of the same company. In theory, fewer users should translate into a faster system. Intranets are very useful for large national and international companies whose branches need to share information. Another benefit of an Intranet is an increased amount of security. Since only company employees have access to the information on the Intranet, their information is protected from competitors. While there is little doubt that the Internet will eventually be a fast and reliable service, industry and the academic community have taken their own steps toward making more practical global networks.

Question: In the passage, which of the following ts NOT true of the Internet?             

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions:

Who talk more – men or women? Most people believe that women talk more. However, linguist Deborah Tannen, who has studied the communication style of men and women , says that this is a stereotype . According to Tannen, women are more verbal – talk more – in private situations , where they use conversation as the “glue” to hold relationships together. But, she says, men talk more in public situations, where they use conversation to exchange information and gain status. Tannen points out that we can see these differences even in children. Little girls often play with one “best friend”, their play includes a lot of conversation. Little boys often play games in groups; their play usually involves more doing than talking. In school, girls are often better at verbal skills, boys are often better at mathematics.         

A recent study at Emory University helps to shed light on the roots of this difference. Researchers studied conversation between children age 3-6 and their parents. They found evidence that parents talk very differently to their son than they do to their daughters. The startling conclusion was that parents use more language with their girls. Specifically, when parents talk with their daughters , they use more descriptive language and more details. There is also far more talk about emotions, especially sadness, with daughters than with sons.  

Question: Which sentence best expresses the main idea of the first paragraph?         

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions:

Who talk more – men or women? Most people believe that women talk more. However, linguist Deborah Tannen, who has studied the communication style of men and women , says that this is a stereotype . According to Tannen, women are more verbal – talk more – in private situations , where they use conversation as the “glue” to hold relationships together. But, she says, men talk more in public situations, where they use conversation to exchange information and gain status. Tannen points out that we can see these differences even in children. Little girls often play with one “best friend”, their play includes a lot of conversation. Little boys often play games in groups; their play usually involves more doing than talking. In school, girls are often better at verbal skills, boys are often better at mathematics.         

A recent study at Emory University helps to shed light on the roots of this difference. Researchers studied conversation between children age 3-6 and their parents. They found evidence that parents talk very differently to their son than they do to their daughters. The startling conclusion was that parents use more language with their girls. Specifically, when parents talk with their daughters , they use more descriptive language and more details. There is also far more talk about emotions, especially sadness, with daughters than with sons.  

  Question: Which sentence best expresses the main idea of the second paragraph?         

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions:

Who talk more – men or women? Most people believe that women talk more. However, linguist Deborah Tannen, who has studied the communication style of men and women , says that this is a stereotype . According to Tannen, women are more verbal – talk more – in private situations , where they use conversation as the “glue” to hold relationships together. But, she says, men talk more in public situations, where they use conversation to exchange information and gain status. Tannen points out that we can see these differences even in children. Little girls often play with one “best friend”, their play includes a lot of conversation. Little boys often play games in groups; their play usually involves more doing than talking. In school, girls are often better at verbal skills, boys are often better at mathematics.         

A recent study at Emory University helps to shed light on the roots of this difference. Researchers studied conversation between children age 3-6 and their parents. They found evidence that parents talk very differently to their son than they do to their daughters. The startling conclusion was that parents use more language with their girls. Specifically, when parents talk with their daughters , they use more descriptive language and more details. There is also far more talk about emotions, especially sadness, with daughters than with sons.  

  Question: Which can be used as a synonym of the word "emotions"?         

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions:

Who talk more – men or women? Most people believe that women talk more. However, linguist Deborah Tannen, who has studied the communication style of men and women , says that this is a stereotype . According to Tannen, women are more verbal – talk more – in private situations , where they use conversation as the “glue” to hold relationships together. But, she says, men talk more in public situations, where they use conversation to exchange information and gain status. Tannen points out that we can see these differences even in children. Little girls often play with one “best friend”, their play includes a lot of conversation. Little boys often play games in groups; their play usually involves more doing than talking. In school, girls are often better at verbal skills, boys are often better at mathematics.         

A recent study at Emory University helps to shed light on the roots of this difference. Researchers studied conversation between children age 3-6 and their parents. They found evidence that parents talk very differently to their son than they do to their daughters. The startling conclusion was that parents use more language with their girls. Specifically, when parents talk with their daughters , they use more descriptive language and more details. There is also far more talk about emotions, especially sadness, with daughters than with sons.  

  Question: Which word could best replace "startling" ?         

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions:

Who talk more – men or women? Most people believe that women talk more. However, linguist Deborah Tannen, who has studied the communication style of men and women , says that this is a stereotype . According to Tannen, women are more verbal – talk more – in private situations , where they use conversation as the “glue” to hold relationships together. But, she says, men talk more in public situations, where they use conversation to exchange information and gain status. Tannen points out that we can see these differences even in children. Little girls often play with one “best friend”, their play includes a lot of conversation. Little boys often play games in groups; their play usually involves more doing than talking. In school, girls are often better at verbal skills, boys are often better at mathematics.         

A recent study at Emory University helps to shed light on the roots of this difference. Researchers studied conversation between children age 3-6 and their parents. They found evidence that parents talk very differently to their son than they do to their daughters. The startling conclusion was that parents use more language with their girls. Specifically, when parents talk with their daughters , they use more descriptive language and more details. There is also far more talk about emotions, especially sadness, with daughters than with sons.  

Question:  Which of the following statements is TRUE about the passage?             

Read the passage and blacken the letter A, B, C or D on your answer sheet to indicate the correct answer to the following qusetions:

How can a plant kill?

People kill. Animals kill. Animals and people kill for food, or they kill their enemies. People and animals can move around and find something to kill. They can run away from an enemy. They can kill it if it is necessary.

Many kinds of animals eat plants. The plants cannot run away from their enemies. Some plants make poison. If an animal eats part of the plant, it gets sick or dies. Animals learn to stay away from these plants. There are many kinds of plants that make poison. Most of them grow in the desert or in the tropics.

Today farmers use many kinds of poison on their farms. Most of these poisons come from petroleum, but petroleum is expensive. Scientists collect poisonous plants and study them. Maybe farmers can use cheap poison from plants instead of expensive poison from petroleum.

Question: Poison from plants is………….than poison from petroleum.         

Read the passage and blacken the letter A, B, C or D on your answer sheet to indicate the correct answer to the following qusetions:

How can a plant kill?

People kill. Animals kill. Animals and people kill for food, or they kill their enemies. People and animals can move around and find something to kill. They can run away from an enemy. They can kill it if it is necessary.

Many kinds of animals eat plants. The plants cannot run away from their enemies. Some plants make poison. If an animal eats part of the plant, it gets sick or dies. Animals learn to stay away from these plants. There are many kinds of plants that make poison. Most of them grow in the desert or in the tropics.

Today farmers use many kinds of poison on their farms. Most of these poisons come from petroleum, but petroleum is expensive. Scientists collect poisonous plants and study them. Maybe farmers can use cheap poison from plants instead of expensive poison from petroleum.

Question: ………………use many kinds of poisons.