单项选择题

According to the passage, the main part of food that many people are eating today is ______.

A．soybeans
B．grain
C．meat
D．milk
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单项选择题
You are advised to rise with a yawn and stretch because it will ______.
A．help to keep your energy for the day's work
B．help you to control your temper early in the day
C．enable you to concentrate on your routine work
D．keep your energy cycle under control all day
单项选择题
Which of the following was most important in the development of the fast packets
A．The increased demand for the transportation of all kinds of cargo.
B．The increase in the number of people who wanted to go to Europe after the war of 1812.
C．The increase in the number of people who wanted to go to America.
D．The increased volume of mail.
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