单项选择题

The microscope can ______ the object 100 times in diameter.

A．magnify
B．increase
C．develop
D．multiply
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单项选择题
The basic causes are unknown, although certain conditions that may lead to cancers have been ______ .
A．identified
B．guaranteed
C．notified
D．conveyed
单项选择题
Bill is an example of a severely disabled person who has become ______ at many survival skills.
A．proficient
B．persistent
C．consistent
D．sufficient
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