单项选择题

We need more people to _________ their blood because there are so many injured men and women in the disaster.

A．inject
B．denote
C．diagnose
D．donate
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单项选择题
The Western custom of exchanging love on Valentine's Day has been introduced into China and is becoming popular among young people.
A．tokens
B．toll
C．transit
D．titles
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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