题型：选词填空（语篇） 题类：常考题 难易度：普通
仁爱科普版九年级上Unit 1 The Changing World Topic 2 The population in developing countries is growing faster.
As we know, the world has a population of 6.8 (billion/billions) and it is increasing (by/to) 80 million every year. China has already (reach/reached) 1.3 billion, so it has the largest population in the world. It's reported that the population in developing countries (is/are) larger and is growing faster than (those/that) in developed countries.
As a result, the population problem has become more serious in (developing/developed) countries.
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