The main purpose of writing these three texts is______. [br] In Science/Health,

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问题 The main purpose of writing these three texts is______. [br] In Science/Health, "Johns Hopking" is______.

选项 A、a famous university
B、a medical centre
C、a 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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