单项选择题

Nobody yet knows how long and how seriously the shakiness in the financial system will ______ the economy.

A．put down
B．settle down
C．drag down
D．knock down
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单项选择题
The______ of our trip to Beijing was the visit to the Palace Museum.
A．climax
B．extremity
C．maximum
D．novelty
单项选择题
The lovers______ across the fields in complete forgetfulness of time.
A．roamed
B．strode
C．skipped
D．jogged
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