单项选择题

The employees worked hard because______.

A．Mr White was kind to them
B．Mr White had a company
C．Mr White often had a joke with them
D．they liked to use computers
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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.
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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