第13题: [单项选择]According to the author, those who wanted to work as scientists ______. A. were the middle class or richer people B. would be employed by the state C. had to prove their fitness before they began their career D. were free to set up their own offices 参考答案:C 答案解析:从文中第二段instituting some sort of probation，．．．undergone by every person be— fore．．．exercise any libera
