单项选择题

Thinking is any mental activity that helps us _________ or solve a problem, make a decision, or fulfill a desire to understand.

A．duplicate
B．simulate
C．formulate
D．verify
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单项选择题
Jack found there wasn't a good primary school in the, so he sent his son to a boarding school far away from home.
A．locality
B．location
C．vicinity
D．proximity
单项选择题
Thousands of workers on strike _________ into the central square, demanding higher wages and better working conditions.
A．mobilized
B．surged
C．invaded
D．soared
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