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     Now natural disasters happen one after another, ______ warns man to treat nature kindly.

        A. it                   B. that                 C. which                    D. as

     

    【答案】

     C

     

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    　　In the atmosphere, carbon dioxide allows the sun’s rays to enter but prevents the heat from escaping．According to a weather expert’s prediction, the atmosphere will be warmer in the year 2050 than it is today, if man continues to burn fuels at the present rate．If this warming up took place, the ice caps in the poles would begin to melt, thus raising sea level several meters and severely flooding coastal cities．Also, the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere．

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    [　　]

    A．

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    B．

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    阅读下面的短文，然后按照要求写一篇150词左右的英语短文。

    In the atmosphere, carbon dioxide acts rather like a one-way mirror —— the glass in the roof of a greenhouse which allows the sun’s rays to enter but prevents the heat from escaping.

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    However, most of the fuel is burnt in the northern hemisphere, where temperatures seem to be falling. Scientists conclude, therefore, that up to now natural influences on the weather have exceeded those caused by man. The question is: Which natural cause has most effect on the weather?

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    1.以约30个词概括短文的要点；

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