驾驶员生理异常包括()。
A.疲劳
B.药物不良反应态
C.极度高兴
D.酒后反应
参考答案:A, B, D
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China won't be a fast-growing but fragile country. It has to develop it's military strength in order to make
any power think twice _____ trying to offend China's key interests. [ ]
A. before
B. when
C. while
D. until