(单选题)

A sound scientific theory should be one that _________.

A.works not only under one set of conditions at one time, but also under the same conditions at other times

B.does not allow any changes even under different conditions

C.can be used for many purposes

D.leaves no room for improvement

参考答案：A

参考解析：

细节理解题。根据第二段第三句，即“科学家必须在条件允许的情况下尽可能正确”。故本题选A。

知识点：阅读理解四选一英语专业基础知识阅读理解教师招聘-小学英语