单项选择题

The Smithsonian houses a miscellaneous collection of aircraft, artifacts, butterflies, stones [both precious and common], and so on.

A．a heterogenous
B．an overwhelming
C．a unified
D．a vast
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单项选择题
Machiavelli cautions the prince not to relinquish power under passing duress.
A．gain
B．hold
C．control
D．abandon
单项选择题
The new guppies I bought have just a tinge of yellow.
A．dot
B．mark
C．touch
D．tingle
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