单项选择题

The first paragraph mainly tells us______.

A．why we don't feel air
B．why atmosphere is important to us
C．why there is air surrounding us
D．why there is air pressure
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单项选择题
According to the passage, we can conclude that in some areas if farmers who grow grapes light fires in the early morning, that is because the farmers want to______.
A．drive away warm air
B．prevent cold air from coming to harm their plants
C．cause more wind
D．stop warm air running away
单项选择题
What were the primary uses of the horse for early man
A．For food.
B．For power.
C．To make money.
D．To work for him.
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