2. 外语
  3. The main purpose of writing these three texts is ______. In Science/Health, "Johns Hopking" is.

The main purpose of writing these three texts is ______. In Science/Health, "Johns Hopking" is.

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问题 The main purpose of writing these three texts is ______.
In Science/Health, "Johns Hopking" is.
选项 A、a famous university
B、a medical centre
C、well-known doctor
D、a drug company
答案B
解析 从文章的第三部分第二句话，according to the researchers at Johns Hopking and three other medical centers．．．可知，Johns Hopking与其他的研究中心一样，也是一个研究中心，所以正确的答案为B。
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