1 . The vaccine is used to prevent the ____________ of the novel virus. (infect) (所给词的适当形式填空)
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2 . The doctor examined the wound for signs of __________ (infect). (所给词的适当形式填空)
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3 . White blood cells fight ________ (infect). (所给词的适当形式填空)
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4 . There was no danger of transmitting the _______ (infect) through operations. (所给词的适当形式填空)
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2020高三·全国·专题练习
5 . Cholera is a bacterial __________ , which is __________ . (infect) (所给词的适当形式填空)
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