It is said that the population of the world will be (7,000,000,000)by the year 2020.

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1. It is said that the population of the world will be (7,000,000,000)by the year 2020.

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仁爱科普版初中英语九年级上册Unit 1 Topic 2 The population in developing countries is growing faster. Section B同步练习