单项选择题

The scientists began to accumulate dat

A． collectB. handleC. analyzeD. investigate
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单项选择题
The clothes a person wears may express his standing or social position.
A．curiosity
B．status
C．determination
D．significance
单项选择题
We have taken effective measures to preserve our natural resources.
A．protect
B．reserve
C．consume
D．save
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