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
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
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