By "Dr. Clark lived for 112 days", the author most probably means that ______.
A. the replacement of Dr. Clark's bean was a failure
B. there was still a long way to go in applied bionics
C. applied bionics was promising
D. the first artificial heart was most effective
The best title for this text would be
A. Punctual like a Clock
B. A Cold Welcome
C. An Unpunctual Manager
D. Better Late than Never
旋光对映体之间产生相同生理作用，但强弱不同的药物
A. 异丙嗪
B. 氯苯那敏
C. 氯霉素
D. 丙氧芬
E. 多巴胺
引入脂肪族化合物中使活性及毒性均降低的基团是
A. 磺酸基
B. 硝基
C. 卤素
D. 羟基
E. 巯基
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