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Вопрос № 629355 - Английский язык

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Why is an effective vaccine for influenza not available?
Варианты ответов
  • Because the vaccine induces a certain number of adverse reactions.
  • Because influenza is a fundamentally mild affliction.
  • Because the virus tends to change its character from one epidemic to another.
  • Because it can be acquired only in childhood.
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Вопрос задал(а): Анонимный пользователь, 12 Ноябрь 2020 в 20:34
На вопрос ответил(а): Анастасия Степанова, 12 Ноябрь 2020 в 20:34

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