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【多选题】
常用于鉴别盐酸普鲁卡因的反应有()。A.
氧化反应
B.
重氮化一偶合反应
C.
红外光谱法
D.
水解产物反应
E.
碘仿反应
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举一反三
【单选题】Which of the following is NOT true?
A.
All of us can lead varied lives through the pages of books.
B.
We can travel by book free of charge to our heart's content.
C.
We should rely on reading to escape from the seemingly dull realities of everyday life.
D.
Valuable experiences can be obtained from reading good books.
【判断题】Pragmatic factors can not influence our selection of sounds, grammatical constructions, and vocabulary from the resources of the language.()
A.
正确
B.
错误
【单选题】The adult mosquito usually lives for about thirty days, although the life span varied widely with temperature, humidity, and other factors of the environment.
A.
about
B.
although
C.
varied
D.
other
【判断题】Varied factors can influence wo rkplace efficiency. These include exterior factors and interior factors .
A.
正确
B.
错误
【单选题】I ______ the book. I may well borrow one from the library.
A.
need to have bought
B.
need have bought
C.
needed not bought
D.
needn't have bought
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