Các cơ thể đột biến dị bội thường vô sinh vì

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  After it ____________ dry for two months, it rained heavily last night.
  
  

• Choose the best answer for the following sentence:

  When I ______________ to visit him, he ________________ to work.
  
  

• Choose one sentence that has the different meaning to the root one:

  Her living conditions were difficult. However, she studied very well.
  
  

• Choose one sentence that has the different meaning to the root one:

  She likes sports. She likes reading.
  
  

• Choose one sentence that has the different meaning to the root one:

  She met Pierre in 1894 and in the following year they were married.
  
  

• Choose the best answer for the following sentence:

  By the time the boss returned, _______________.
  
  

• Choose the best answer for the following sentence:

  ___________ Lan had turned off the light.
  
  

• Choose the best answer for the following sentence:

  Kim said that ____________.
  
  

• Find a mistake in the four underlined parts of the sentence and correct it:

  Population density in the Red River Delta is by now more densely populated region in

  Vietnam with 1,136 people per square kilometer.

• Find a mistake in the four underlined parts of the sentence and correct it:

  The twentieth century saw the largest total century population increase ever. At the

  beginning there were 1.6 billions people and at the end of the century there were 6.1.