The ozone layer is becoming depleted; ………, there are more cases of skin cancer every year.

Câu hỏi :

The ozone layer is becoming depleted; ………, there are more cases of skin cancer every year.

A however    

B  therefore   

C  in contrast  

D on the other hand

* Đáp án

B

* Hướng dẫn giải

Phương pháp giải:

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