2. 外语
  3. The purpose of this text is______。 Which of the following is true?

The purpose of this text is______。 Which of the following is true?

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问题 The purpose of this text is______。
Which of the following is true?
选项 A、The vegetable vaccines are more effective than those produced in traditional ways.
B、The new technique is especially useful in developing countries.
C、This research team has already tested the technique in bananas.
D、Previously there existed no vaccine against hepatitisb.
答案B
解析 见第一段，“They believe this technique could prove to be a cost-effective way of growing vaccines in developing countries where such diseases are still killers．”他们相信，在此类疾病仍致人死亡的发展中国家，这项技术将能被证明是一种低成本的培养疫苗方法。
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