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    We all know that it is impossible for ordinary people to make their homes on the equator (赤道), although often they may feel uncomfortable there. Millions do it. But as for the North Pole we know that it is not only a dangerously cold place, but also that people like you and me would find it quite impossible to live there. At the present time only the scientists and explorers can do so, and they use special equipment. Men have been traveling across and around the equator on wheels on their feet or by ships for thousands of years; but only a few men, with great difficulty and in very recent time, have ever crossed the ice to the North Pole. So it may surprise you to learn that, when traveling by air, it is really safer to fly over the North Pole than over the equator. Of course this is not true about landing in the polar region (which passenger aeroplanes do not make), but the weather, if we are flying at a height of 5 000 meters above the Pole is a delight. At 4 000 meters and more above the earth you can always be sure that you will not see a cloud in the sky as far as they can reach in the tropics (热带), on the other hand, you are not certain to keep clear of bad weather at such heights as 18 000 or 20 000 meters.

    Aeroplanes cannot climb as high or as quickly in cold air as in warm. Nor can clouds. In practice, this is an advantage to the aeroplane, which is already at a good height when it reaches the polar region and so does not need to climb, while at the same time cold air keeps the clouds down.

    1.Scientists can live in the North Pole because ______.

    A. they know the place well

    B.they are specially trained

    C.they are not ordinary people

    D.they are well equipped

    2.From the passage we know that the polar region is ______.

    A.a good place to reach by sea

    B.an attracting place covered by various kinds of plants

    C.a good place to fly over

    D.a good place to go on holiday

     

    答案：1D2C
    解析：

    1、At the present time only the scientists and explorers can do so, and they use special equipment.根据这句可知答案。

    2、由文章最后一段可知答案应为C。

     


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