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【单选题】
在合成工序的安排中，贵重原料放在何位置，手性中间体的构建又放在何位置（ ）。A.
贵重原料靠路线的前端放置，手性中间体的构建 靠路线的前端放置。
B.
贵重原料靠路线的前端放置，手性中间体的构建靠路线的后端放置。
C.
贵重原料靠路线的后端放置，手性中间体的构建靠路线的前端放置。
D.
贵重原料靠路线的后端放置，手性中间体的构建应按照手性构建方法的不同权衡利弊，合理安排 。
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反馈参考答案：
举一反三
【单选题】If he doesn't know the word he can______in a dictionary.
A.
make it out
B.
look it up
C.
pick it out
D.
make it away
【单选题】The young man is upset because he doesn’t know how he can get it ______ to the pretty girl how much he loves her. [ ]
A.
across
B.
up
C.
down
D.
around
【单选题】I am very surprised that even an expert on foreign affairs can know the painting is forgery. （）he can tell who painted it.
A.
However
B.
Otherwise
C.
Nevertheless
D.
Moreover
【单选题】Suture removal time of head and neck surgery is
A.
2~3days
B.
3~4days
C.
4~5days
D.
5~6days
E.
6~7days
【单选题】suture removal time after head and neck surgery is
A.
2~3day
B.
3~4day
C.
4~5 day
D.
5~6days
E.
6~7days
【单选题】The problem with Luis is that he doesn't know his ________—he just assumes he can do everything.
A.
limit
B.
limited
C.
limitless
D.
limitations
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