the book,（）are truth stories about great scientists of 20th,

关于 ：介词+关系代词 引导的定语从句,考点往往是介词的选择.
突破方法建议如下：
把定语从句用简单句表达,如上句：True stories about great scientists of 20th are in the book
逻辑通顺,符合语法,故答案是：in which
再如：The book ,of which the price is too high isn't well received .
转换如下：the price of the book is too high
符合逻辑,语法通顺
再问： 转化过来都困难，怎么办呢