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  3. The world’s population continues to grow. There now are about 4 billion of us on earth. That could reach 6 billion by the end of

The world’s population continues to grow. There now are about 4 billion of us on earth. That could reach 6 billion by the end of

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问题 The world’s population continues to grow. There now are about 4 billion of us on
earth. That could reach 6 billion by the end of the
century and 11 billion in a farther 75                                                   【M1】______
years. Experts have long been concerned about such a growth. Where will we find the
food, water, works, houses, schools and health care for all these people? A major new    【M2】______
study shows that the situation may be changing. A large and rapid drop in the world’s
birth rate have taken place during the past 10 years. Families generally are smaller now 【M3】______
than they were a few years ago. It is happened in both developing and industrial nations.【M4】______
Researchers said they found a number of reasons for this. More men and women are
waiting more longer to get married and are using birth control devices and methods to    【M5】______
prevent and delay pregnancy. More women are going to school or working at jobs away      【M6】______
from home instead having children. And more governments, especially in developing        【M7】______
nations, now support family planned programs to reduce population growth. China is       【M8】______
one of the nations that has made great program in reducing its population growth.        【M9】______
China has already cut off its rate of population growth by about one half since 1970.   【M10】______
【M4】
选项
答案happened→happening。
解析 语态是主动，且为现在进行时。
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