Xét hai dây dẫn cùng chất liệu và cùng chiều dài. Bán kính dây 1 gấp hai lần bán kính dây 2. Nếu dây 2 có điện trở R thì điện trở của dây 1 là

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 24 to 28:

Few people now realize the reality of global warming and its effects on the world’s climate. Many scientists (24) _______ the blame for recent natural disasters on the increase in the world’s temperatures and are convinced that, more than ever before, the Earth is at (25) _______ from the forces of the wind, rain and sun. According to them, global warming is making extreme weather events, such as hurricanes and droughts, even more severe and causing sea levels all around the world to rise. Environmental groups are putting pressure on governments to take action to reduce the amount of carbon dioxide which is given (26) _______ by factories and power plants, thus attacking the problem at its source. They are in (27) _______ of more money being spent on research into solar, wind, and wave energy devices, which could then replace existing power (28) _______. Some scientists, however, believe that even if we stopped releasing carbon dioxide and other gases into the atmosphere tomorrow, we would have to wait several hundred years to notice the results. Global warming, it seems, is to stay.

Question 28:        

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 36 to 40:

What sort of job should you look for? Much depends on your long - term aim. You need to ask ______(36) whether you want to specialise in a particular field, work your way up to higher levels of responsibility or _____(37)of your current employment into a broader field. This job will be studied very carefully when you send your letter of ________(38) for your next job. It should show evidence of serious career planning. Most important, it should extend you, develop you and give you increasing responsibility. Incidentally, if you are interested in travelling, now is the time to pack up and go. You can do temporary work for a ______(39) when you return, pick up where you_____(40) left off and get the second job.

Question 36: 

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 36 to 40:

What sort of job should you look for? Much depends on your long - term aim. You need to ask ______(36) whether you want to specialise in a particular field, work your way up to higher levels of responsibility or _____(37)of your current employment into a broader field. This job will be studied very carefully when you send your letter of ________(38) for your next job. It should show evidence of serious career planning. Most important, it should extend you, develop you and give you increasing responsibility. Incidentally, if you are interested in travelling, now is the time to pack up and go. You can do temporary work for a ______(39) when you return, pick up where you_____(40) left off and get the second job.

Question 37: 

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 36 to 40:

What sort of job should you look for? Much depends on your long - term aim. You need to ask ______(36) whether you want to specialise in a particular field, work your way up to higher levels of responsibility or _____(37)of your current employment into a broader field. This job will be studied very carefully when you send your letter of ________(38) for your next job. It should show evidence of serious career planning. Most important, it should extend you, develop you and give you increasing responsibility. Incidentally, if you are interested in travelling, now is the time to pack up and go. You can do temporary work for a ______(39) when you return, pick up where you_____(40) left off and get the second job.

Question 38: 

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 36 to 40:

What sort of job should you look for? Much depends on your long - term aim. You need to ask ______(36) whether you want to specialise in a particular field, work your way up to higher levels of responsibility or _____(37)of your current employment into a broader field. This job will be studied very carefully when you send your letter of ________(38) for your next job. It should show evidence of serious career planning. Most important, it should extend you, develop you and give you increasing responsibility. Incidentally, if you are interested in travelling, now is the time to pack up and go. You can do temporary work for a ______(39) when you return, pick up where you_____(40) left off and get the second job.

Question 39: 

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:

A typical person needs about 1,800 calories per day to stay running. They keep your organs operating (31) ________ and your brain running. They also keep your body warm. A person gains weight because he or she consumes more calories per day than necessary. The only way to lose fat is to reduce the number of calories that you consume per day. This is the basic principle (32) ________ going on a diet. Unfortunately, diets don't work for most people. They do lose weight but then go off the diet and put it back. Building a sensible diet and exercise plan is the key to maintaining a consistent weight. You need to figure out how many calories you need in a day and how many you actually (33) ________. The next step is to add exercise so that you can raise the number of calories you can consume per day. Burning 250 or 500 calories per day can make a big (34) ________. You can ride an exercise bike while you are watching television or you can take the stairs instead of the elevator. Find an exercise partner. Exercises can be a lot easier if there is someone to talk to. It’s a good idea to wear firm fitting clothes if you are (35) ________. Tight clothing acts as a reminder of what you are trying to accomplish.

Question 31:

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:

A typical person needs about 1,800 calories per day to stay running. They keep your organs operating (31) ________ and your brain running. They also keep your body warm. A person gains weight because he or she consumes more calories per day than necessary. The only way to lose fat is to reduce the number of calories that you consume per day. This is the basic principle (32) ________ going on a diet. Unfortunately, diets don't work for most people. They do lose weight but then go off the diet and put it back. Building a sensible diet and exercise plan is the key to maintaining a consistent weight. You need to figure out how many calories you need in a day and how many you actually (33) ________. The next step is to add exercise so that you can raise the number of calories you can consume per day. Burning 250 or 500 calories per day can make a big (34) ________. You can ride an exercise bike while you are watching television or you can take the stairs instead of the elevator. Find an exercise partner. Exercises can be a lot easier if there is someone to talk to. It’s a good idea to wear firm fitting clothes if you are (35) ________. Tight clothing acts as a reminder of what you are trying to accomplish.

Question 32:

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:

A typical person needs about 1,800 calories per day to stay running. They keep your organs operating (31) ________ and your brain running. They also keep your body warm. A person gains weight because he or she consumes more calories per day than necessary. The only way to lose fat is to reduce the number of calories that you consume per day. This is the basic principle (32) ________ going on a diet. Unfortunately, diets don't work for most people. They do lose weight but then go off the diet and put it back. Building a sensible diet and exercise plan is the key to maintaining a consistent weight. You need to figure out how many calories you need in a day and how many you actually (33) ________. The next step is to add exercise so that you can raise the number of calories you can consume per day. Burning 250 or 500 calories per day can make a big (34) ________. You can ride an exercise bike while you are watching television or you can take the stairs instead of the elevator. Find an exercise partner. Exercises can be a lot easier if there is someone to talk to. It’s a good idea to wear firm fitting clothes if you are (35) ________. Tight clothing acts as a reminder of what you are trying to accomplish.

Question 33:

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:

A typical person needs about 1,800 calories per day to stay running. They keep your organs operating (31) ________ and your brain running. They also keep your body warm. A person gains weight because he or she consumes more calories per day than necessary. The only way to lose fat is to reduce the number of calories that you consume per day. This is the basic principle (32) ________ going on a diet. Unfortunately, diets don't work for most people. They do lose weight but then go off the diet and put it back. Building a sensible diet and exercise plan is the key to maintaining a consistent weight. You need to figure out how many calories you need in a day and how many you actually (33) ________. The next step is to add exercise so that you can raise the number of calories you can consume per day. Burning 250 or 500 calories per day can make a big (34) ________. You can ride an exercise bike while you are watching television or you can take the stairs instead of the elevator. Find an exercise partner. Exercises can be a lot easier if there is someone to talk to. It’s a good idea to wear firm fitting clothes if you are (35) ________. Tight clothing acts as a reminder of what you are trying to accomplish.

Question 34:

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:

Royal Residences Buckingham Palace, Windsor Castle and the Palace of Holyroodhouse are the official (31) ________ of the Sovereign and as such, serve as both home and office for the Queen, whose personal flag flies (32) ________ her Majesty is in residence. These buildings are used extensively for State ceremonies and official entertaining and are opened to the (33) ________ as much as these commitments allow. They are furnished with fine pictures and (34) ________ of art from the Royal Collection, assembled over four centuries by successive sovereigns. Many of the State Apartments and rooms at the official residences have been in continuous use since their concept on and many of the paintings are (35) ________ in the rooms for which they were originally intended.

Question 35: