单选题 The framework of the special theory of relativity can be constructed from the ______ of the absolute invariability of the speed of light.
A. regulation B. conviction
C. definition D. assumption

【正确答案】 D
【答案解析】assumption“假定,假设”;regulation“管理;规章”;conviction“深信,确信”;definition“定义”。理论的建立一般都是先有“假定”,然后经过实践确认才成立,所以用assumption。