单项选择题

The microscope enables scientists to distinguish an (incredible) number and variety of bacteria.

A．unavoidable
B．unchangeable
C．unbelievable
D．unpredictable
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单项选择题
The senator agreed that his support of the measure would (jeopardize) his chances for reelection.
A．benefit
B．endanger
C．hinder
D．disturb
单项选择题
Racing the clock every day is such an exhausting effort that when I actually have a few free moments, I tend to (collapse).
A．fall down
B．fall ill
C．fall out
D．fall behind
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