单项选择题

The atmosphere is as much a part of the earth as ______ its soils and the water of its lakes, rivers and oceans.

A．do
B．has
C．is
D．are
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单项选择题
The topic with which the article is concerned is （）

A．natural foods
B．eating habits
C．healthy eating
D．food problems
单项选择题
In the last paragraph, people are recommended to have （）

A．foods containing large quantities of refined flour and vegetables
B．foods with fibers removed
C．foods with more fibers
D．food with additives
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