单项选择题

His （）directions confused us; we did not know which of the two roads to take.

A．ambiguous
B．complicated
C．arbitrary
D．intricate

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单项选择题
Certain species disappeared or became （）as new forms arose that were better adapted to the Earth's changing environment.

A．feeble
B．extinct
C．massive
D．extinguished
单项选择题
There was once an（）idea that the earth was fiat and motionless.

A．absurd
B．intrinsic
C．eternal
D．offensive
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