2. 外语
  3. The purpose of this text is______。 Which of the following is not a plant that can be used to grow vaccines?

The purpose of this text is______。 Which of the following is not a plant that can be used to grow vaccines?

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问题 The purpose of this text is______。
Which of the following is not a plant that can be used to grow vaccines?
选项 A、potato
B、tobacco
C、agrobacterium tumefasciens
D、banana
答案C
解析 本文第三段提到了用烟草来制成疫苗，最后一段也提到了用土豆或香蕉来制成疫苗，故C是正确答案。
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