单项选择题

The reform in economic system will help______ and develop the socialist economic base.

A．consolidate
B．enhance
C．elevate
D．prolong
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单项选择题
They are to meet the landlord on Friday to sign the______ for their new apartment.
A．appointment
B．lease
C．penalty
D．pledge
单项选择题
Too much______ to X-rays can cause skin burns, cancer or other damage to the body.
A．manifestation
B．revelation
C．attachment
D．exposure
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