皮皮学，免费搜题
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搜题
【单选题】
与细菌相比，病毒特有的性状变异是A.
毒力变异
B.
抗原变异
C.
空斑变异
D.
耐药性变异
E.
菌落变异
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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.
【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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