填空题

Today atmospheric carbon dioxide concentrations are 31 percent more than that of______.

【参考答案】

1750
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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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