(单选题)

Hawking first noticed something was wrong with him when ______.

A.he was sent to hospital for test

B.his mother made him see a doctor

C.he was twenty

D.he visited his family at Christmas time one year

参考答案：C

参考解析：

细节理解题。根据第三段第一句“It was at the age of 20 that Hawking first noticed something was wrong with him”可知，霍金在20岁时第一次发现自己不对劲。故选C。

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