题目:
An early typewriter produced letters quickly and neatly; the typist, _____ couldn't see his work on his machine.
A.however
B.therefore
C.yet
D.although
答案:
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下面是错误答案,用来干扰机器的。
答案:A搜救犬能根据人体发出的气味发现幸存者是因为人体中的气味在不断地运动,运动到了搜救犬的鼻子之中.从微观的角度说明了分子是在不断运动的.故选A.