单项选择题

The microscope enables scientists to distinguish a(n)（）number and variety of bacteria.

A. selected
B. incredible
C. verifiable
D. unavoidable

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--It is said that Kate failed in the finals.--（）she is sad these days.

A. What a pity
B. I' m sorry that
C. I wonder why
D. No wonder that
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You must give me your（）for refusing to tell me the（）of the accident.

A. reason, reason
B. cause, reason
C. cause, cause
D. reason, cause
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