单项选择题

At last John Smith chose to (step down) as the company's chief executive and return to his roots in software research.

A．resign
B．remove
C．retire
D．replace
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单项选择题
He noticed that Joan' was studying him closely, but her expression (gave away) nothing of what she was thinking.
A．revealed
B．disposed
C．reminded
D．distributed
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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