单项选择题

To prove their theories, scientists must ______ an adequate amount of data as evidence.

A．stimulate
B．reproduce
C．reserve
D．accumulate
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单项选择题
Much to the students' relief, the mid-term exam was______.
A．let off
B．taken off
C．left off
D．cut off
单项选择题
She murmured something and blushed as if a secret had been______.
A．imposed
B．exposed
C．removed
D．renewed
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