The world population today is about 6 billion. But only about 1 percent of t

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问题 The world population today is about 6 billion. But only about 1 percent of the world’s land is【T1】______for farming. However, the area of farmland is becoming smaller and smaller every year. So it will be difficult to feed so many mouths. There are several reasons why farmland is【T2】______First, a lot of the land is being used for the【T3】______of houses. Secondly, some of the land has become wasteland because【T4】______have removed the top soil. Thirdly, some of the land has become too salty to【T5】______. Therefore, a big problem that we face today is hunger. [br] 【T5】

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答案 grow crops

解析空格前为too．．．to．．．结构，由此可知此处填入动词原形。可根据土地盐碱化后不能耕种作物的常识，结合录音，此处填入grow crops。

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