I have read a series of stories about some world famous great scientists are from our coun

问题补充：

I have read a series of stories about some world famous great scientists,are from our country.

A. two of them

B. two of whom

C. both of them

D. both of whom

答案：

A. two of them

(答案→)B. two of whom

C. both of them

D. both of whom

解析：考查定语从句。Scientists是先行词，在定语从句are from our country中作介词of的宾语，them不能引导定语从句，排除A,C；two of whom是科学家中的两个，both of whom两个科学家都……。句子中指的是一些科学家，而不是两个。所以选B。