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【单选题】
分子式为C 5 H 13 N的胺B,其彻底甲基化消耗2mol的 CH 3 I,经霍夫曼消除,最终生成乙烯和一个叔胺,则B的结构为A.
结构式A
B.
结构式B
C.
结构式C
D.
结构式D
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【单选题】_______ Switzerland is very small, _______ it is the land of watch and it is very rich. [ ]
A.
Though; but
B.
Because; so
C.
Because; /
D.
Though; /
【简答题】Although it is very small, it has got multifunctions.
【单选题】________Switzerland (瑞士) is very small , _______it is the land of watch and it is very rich.
A.
Though; but
B.
Because ; so
C.
Because ; /
D.
Though ; /
【单选题】They have ______ to cover both of them.
A.
too small an umbrella
B.
very small an umbrella
C.
a too small umbrella
D.
a small umbrella
【单选题】75 cents ______.
A.
is a large sum of money
B.
is a small sum of money
C.
is important in a computer system
D.
can buy a computer at that time
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