问题
选择题
Too much drinking will do ____to your health; you should take the doctor's advice. [ ]
A. harm
B. harmful
C. trouble
D. painful
答案
答案：A
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Too much drinking will do ____to your health; you should take the doctor's advice. [ ]
A. harm
B. harmful
C. trouble
D. painful
答案：A
，则小物体下滑到斜面底端B时的速度 m／s及所用时间 s．（g取10 m/s2）