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.
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