(单选题)

Which of the following is NOT mentioned as a way to measure the time? ( )

A.Counting the beating of one’s heart

B.Marking use of candles, sand and water

C.Observing shadows cast by the sun

D.Keeping slaves busy day and night

参考答案：D

参考解析：

根据题干关键词way to measure the time定位至第三段…measuring the time of day according to the beating of their own hearts.(选项A)和第四段…men quickly found more convient and reliable ways of telling the time. They learned to use the shadows cast by the sun. (选项C) They marked the hours on candles, used sand in hour-glass, and invented water-clocks.(选项B)。只有D项内容没有提及，故正确答案是选项D。

知识点：是非题英语阅读理解通用英语