单项选择题

A．They are very friendly.
B．They are some nice people.
C．They are very quiet.
D．They are not sociable.
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单项选择题
A．He thinks it is rather hot.B．He thinks it is really warm.C．He thinks it is not warm.D．He thinks it is very comfortable.
A．He thinks it is rather hot.
B．He thinks it is really warm.
C．He thinks it is not warm.
D．He thinks it is very comfortable.
填空题
As early as 1896 scientists suggested that burning fossil fuels might change______.
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