阅读部分第19题：A number of pests are now born with an innate immunity to som-考呗网题库移动版

填空题阅读部分第19题：A number of pests are now born with an innate immunity to some pesticides．

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解析:YES

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填空题阅读部分第20题：Biological control entails using synthetic chemicals to try and change the genetic make-up of the pests’offspring.

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填空题阅读部分第21题：Bio-control is free from danger under certain circumstances．

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填空题Complete each sentence with the correct ending, A--I, below．
Write the correct letter, A--I, in boxes 22—26 0n your answer sheet．

阅读部分第22题：Disapene scale insects feed on

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