单项选择题

Most of us have come to expect ______.

A．no variation in our diet
B．a reduction in food supplies
C．a specialist diet
D．food conforming tea set standard
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单项选择题
According to the passage, people in the West today survive on ______.
A．carrots and tomatoes
B．several thousand types of plants and cereals
C．a very small number of cultivated foods
D．special species planted one thousand years ago
单项选择题
People enjoy listening to music, ______.
A．though they are receiving a lot of decibels of sound in fact
B．because it does not have any negative effect
C．because they do not have to tolerate the noise around them
D．even though it is sometimes unpleasant hearing strange sound
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