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67. 理论如果和实践相结合是毫无意义的。 

68. 如果你不经禽锻炼就容易生病。 

69. 环境的污染已经弓丨起了许多非常严重的社会问题。 

70. 他担心会误了火车,所以早早就出发了。 

A、The pollution of the environment has givenrise to many serious social problems . 

B、He left very early for fear of missing train. 

C、You are liable to get sick if you do not dophysical exercise often. 

D、Theories art meaningless unless they areapplied practice.

67____________

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