题目内容

当吸光度A=0时,则透光率T/%=()

A. 50
B. 20
C. 1
D. 100

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--- Tom graduated from college at a very young age.--- Oh, he ______ have been a very smart boy then.

A. could
B. should
C. might
D. must

--- I don't mind telling you what I know.--- You ______. I'm not asking you for it.

A. mustn't
B. may not
C. can't
D. needn't

--- Excuse me, but I want to use your computer to type a report. --- You _____have my computer if you don't take care of it.

A. shan't
B. might not
C. needn't
D. shouldn't

I _____ have left my sunglasses in the coffee shop yesterday as I can’t find them now.

A. perhaps
B. may
C. maybe
D. should

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