单项选择题

A．They get a bargain right away.
B．They have a look at the advertisement.
C．They sell their TV set.
D．They go and buy a big TV set.
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单项选择题
Why do people of heart disease often feel uncomfortable while taking a flight
A．Because low pressure can cause the air in body cavities to expand.
B．Because medical devices implanted in their bodies expand.
C．Because they tend to sit too long in a cramped position.
D．Because the amount of oxygen flowing through their blood vessels is reduced and thus causing chest pains.
单项选择题
My tutor ______ some theories of evolution which had historically preceded that of Charles Darwin.
A．elaborated on
B．found fault with
C．presided over
D．took after
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