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.
【M6】

选项

答案theirself改为themselves。

解析 本题考查反身代词。表示“他们自己”的反身代词为themselves,英语词汇中没有theirself。
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