单项选择题

The main factor in changing the amount of heat on the earth is（）

A．man's agriculture and industry ways
B．natural weather
C．wind and rain
D．clouds

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单项选择题
The weather of the world seems to be getting（）

A．hotter
B．colder
C．warmer
D．freezing
单项选择题
James' family led a （） life when she was born.

A．miserable
B．happy
C．well-off
D．hardly
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