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
On the top of some very high mountains snow ______ throughout the year.
A．insisted
B．persevered
C．persisted
D．kept
单项选择题
The story you told me the other day has yet to be ______.
A．confessed
B．confirmed
C．conquered
D．conformed
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