47. What does the author think is a more effective measure for driving

　　46 Why does the formula of tax cuts remain popular though ineffective?　　A) Its critics& 39; voice has not

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　　45 In the long term, the potential for small farms in Africa to increase productivity is quite limited, esp

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　　44 Improvement in farm output per worker in Africa falls far short of that in Asia 　　答案&解析　　44 答案解

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　　43 Everyone in the world will have to bear the consequences of climate change, especially Africans 　　答案&解

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　　42 It has proved even more important to shift from traditional farming to setting up businesses that can br

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