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11 tháng 7 2017

The world's population passed five-billion mark in 1987 and it is increasing (1)________ about 1.7% a year. At this rate of growth, the number of people in the world will (2)_________ every 41 years. This rapid increase has been called the (3)_________ explosion. No one knows how many people the Earth can (4)________ Many scientists belive that the world will soon become (5)_________, that is, it will have more people than it can support

1 A. of B. by C. to D.in

2 A. doubled B. to double C. doubling D. double

3 A. pollution B. polluted C. populated D. population

4 A. supports B. support C. supporting D. be suppported

5 A. overpopulated B. polluted C. populated D. overpopulation

11 tháng 7 2017

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