单项选择题

About one million Americans are diagnosed annually with skin cancer.

A．every year
B．severely
C．actively
D．every month
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单项选择题
They agreed to modify their policy.
A．clarify
B．define
C．change
D．develop
单项选择题
Enormous sums of money have been spent on space exploration.
A．Much
B．Large
C．Small
D．Fixed
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