1 . Exactly which germs cause the ________ (infect) is still unknown. (所给词的适当形式填空)
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2 . Exactly which bacteria cause the ______ (infect) is still unknown. (所给词的适当形式填空)
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3 . There is a saying that the _________ (infect) has been present in humans for a very long time. (所给词的适当形式填空)
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4 . Taking longterm courses of certain medicines may increase risks of ________ (infect).(所给词的适当形式填空)
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5 . The ear ________ (infect) is common in preschool children. (所给词的适当形式填空)
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6 . Washing your hands frequently is a simple but effective way to prevent the transmission of ________ (infect). (用所给词的适当形式填空)
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7 . Shaking hands with people____________ with HIV won't cause____________ .(用infect的正确形式填空)
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8 . People should take protective measures before going out to prevent____________ .(用infect的正确形式填空)
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9 . The vaccine is developed to protect the whole population against _____________ (infect) of COVID-19. (所给词的适当形式填空)
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10 . The risk of potential ___________ (infect) is much higher among children. (所给词的适当形式填空)
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