Question

—Stephen Hawking, the world﹣famous British scientist, died          the age of 76.

—I'm sorry to hear that, One of science's brightest stars went dark.

A.at B.in C.on D.of

Answer

A

【解析】

句意：——著名的英国科学家斯蒂芬·霍金去世，享年76岁。——很遗憾听到这个消息，一颗最亮的科学之星熄灭了。

考查介词辨析。A. at在；B. in在……里面；C. on在……上面；D. of……的。根据Stephen Hawking, the world﹣famous British scientist, died the age of 76.可知这里考查at the age of表示“在…多少岁时”，故答案选A。