A) The pollution of the environment has given rise to many serious social problems. B) He left very early for fear of missing th

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问题 A) The pollution of the environment has given rise to many serious social problems.
B) He left very early for fear of missing the train.
C) You are liable to get sick if you do not do physical exercise often.
D) Theories are meaningless unless they are applied to practice.
理论如果不和实践相结合是毫无意义的。

选项 A、 
B、 
C、 
D、 

答案D

解析
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