单项选择题

Section B
What proportion of Americans does not get enough sleep according to the NSF poll

A．One third.
B．Almost two thirds.
C．More than two thirds.
D．Almost half.
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How did Green advertisements change after the first wave
A．They became more popular.
B．They were more regulated.
C．They became better produced.
D．They became less honest.
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How long will the whale-watching trip last
A．One hour.
B．Two hours.
C．Three hours.
D．Four hours.
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