单项选择题

The President call on his people to work hard to improve the ________economy.

A．stationary
B．static
C．steady
D．stagnant
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单项选择题
His writing is so ________that we can' t clarify his ideas in first reading.
A．obscure
B．objective
C．obliging
D．obstacle
单项选择题
The past decade has been the warmest for 1,000 years, according to a(n) ________of ice cores drilled from a glacier(冰川) in the Himalayas.
A．analogy
B．analysis
C．anniversary
D．appendix
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