单项选择题

A．The effects of the flood.
B．The heroic fight against a flood.
C．The cause of the flood.
D．Floods of the past twenty years.
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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.
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.
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.
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