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16. 选A。细节推断题。从原文第一段“Later，they found it was easier to tell the exact time by looking at the shadows. Thus，the sundial(日晷) was invented.”中，可以推测选项A正确。其它选项都与原文中的信息不符。
17. 选B。细节理解题。 由第二段最后一句 “Three—minute sand glasses are still used in many homes to time the boiling of eggs.”可知选项B正确。
18. 选B。图文推断题。 由第二段 “Two glass bottles were connected by a small opening”可知选项B正确。
19. 选C。细节理解题。由第三段最后一句 “Visitors to the Beijing Palace Museum can still see the old water clocks showing the time there.”可知选项C正确。。
20. 选B。细节理解题。 由最后一段第二句 “To keep the weight falling at the same speed，a system of wheels was invented.”可知选项B正确。