单项选择题

Which of the following is true

A．There weren't any cows in Florida.
B．Mr White had a joke with the guide.
C．Mr White hadn't seen any cows before.
D．The cows in Florida were much bigger than those in Australia.

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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

单项选择题

Air moves under such conditions that______.

A．there is air pressure
B．the air is heavy
C．air pressure doesn't remain the same all the time
D．air comes up and down