選擇正確的單詞填空

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、________

答案：注意理解后，選正確。
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