Many scientists believe biotech __________________________.(生物技术能够把发展中国家的农业总产量提高

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问题 Many scientists believe biotech __________________________.(生物技术能够把发展中国家的农业总产量提高25%)

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答案 could raise (increase)overall crop productivity in developing countries as much as (bu)25%

解析提高多少用短语“increase/raise... by...”来表述。

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