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

According to the passage, meat will completely disappear in the future because （）

A．people have to spend too much time and energy to produce it
B．too much grain protein is needed to produce it
C．it contains too much fat and protein
D．it is not good to the health