Khí ôzôn ở tầng bình lưu được hình thành dưới tác dụng của:

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  Why do you always talk in such a scornful manner?

  If I __________ in your shoes, I _________ so rude.
   

• Choose the best answer for the following sentence:

  if __________ you less, you ___________ much better.
   

• Choose the best answer for the following sentence:

  She looked at him as if she __________ a ghost.
   

• Choose the best answer for the following sentence:

  He looked as if he __________ to stay something but ___________ afraid to begin his speech.
  
  

• Choose the best answer for the following sentence:

  They stared at each other in silence, and it was as if they __________ for distan footsteps.
   

• Choose the best answer for the following sentence:

  If he __________ cleverer, he __________ so foolishly yesterday.

• Choose the best answer for the following sentence:

  If I __________ English well, I ____________ the article long ago.
  
  
  

• Choose the best answer for the following sentence:

  I ____________ part in the last competition if I __________ younger.
   

• Choose the best answer for the following sentence:

  If he _________ his work yesterday, he __________ free today.
   

• Choose the best answer for the following sentence:

  If you ____________ into accounts his behavior then, you ____________ so much trouble now