单项选择题

My father ______ his brow. clearly puzzled by the letter he had just received.

A．scratched
B．wrinkled
C．jerked
D．wrenched
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单项选择题
It is a common ______ : Should you stay where you have friends and family, or take that good job in a far-away city
A．perplexity
B．paradox
C．bewilderment
D．dilemma
单项选择题
Prices ______ , in response to harvests, natural disasters and political instability; and when they rise, it takes some time before new sources of supply become available.
A．vibrate
B．fluctuate
C．flutter
D．swing
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