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  3. The next great land area that man hopes to colonize is the moon. In size it is near equal to the area of North and

The next great land area that man hopes to colonize is the moon. In size it is near equal to the area of North and

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问题     The next great land area that man hopes to colonize is
the moon. In size it is near equal to the area of North and                  【M1】______
South America. However, it presents a hostile
environment that temperatures range from + 120 to- 150                       【M2】______
degrees Centigrade. There is no air, no water.
    Today there is considerate scientific speculation about                  【M3】______
living on the mood. When man will begin life on the lunar
surface is still not determined. So experts believe that                     【M4】______
colonization will take place in three steps. First, there will
be increasing periods of exploration with temporarily                        【M5】______
shelters. These periods will be followed by longer stays
with housing Under the surface of the moon and daily
necessities brought by the colonizers theirself. Finally,                    【M6】______
colonies that are self-supporting will be established.
    The principal job of the early settlers will be to stay
living. They will have to plant crops under huge domes (圆                   【M7】______
顶建筑) to produce food and oxygen and find water
sources. When this has done, the settlers will have time to                  【M8】______
explore the possibilities of commercial development and to
make discoveries important to science.
    The characteristics of the moon that makes it had for                    【M9】______
human survival may make it ideal for certain kinds of
manufacturing. Operations required a vacuum, extreme                         【M10】______
cold are examples. Precision ball bearings, and industrial
diamonds might be produced on the moon.
【M4】
选项
答案So改为But。
解析 本题考查上下文逻辑关系。根据上下文内容，此处应为转折关系，而so表示因果关系。
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