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10,000 years ago, the world’s population(人口)was very 1 .For several thousand years it grew quite 2 .But during the last three or four hundred years it has grown very 3 .Today it is still grow 4 than ever before.This means we must grow 5 food; and have 6 families with 7 but 8 children.If we don’t do these things, the results will be very 9 .There will not be enough space even to stand in on the earth.
1、________ 2、________ 3、________ 4、________ 5、________
6、________ 7、________ 8、________ 9、________
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