单项选择题
In 1984, President Ronald Reagan proposed that the United States construct a launch laboratory for a new era of space
exploration
.
A．probing
B．revenge
C．invasion
D．expansion
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单项选择题
A number of animals in Aesop' s fables are portrayed as being crafty.
A．vain
B．virtuous
C．artistic
D．cunning
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单项选择题
Many politicians find that they can no longer afford the luxury of a personal chauffeur.
A．valet
B．driver
C．secretary
D．servant
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