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[填空题]Clocks through Time
It took human being a long time to invent diverse ways for telling time. About
3000 years ago people first made a circle with a stick in the center of it to (1) [1] ____.
_____ the passage of time by noticing various marks on the circle the shadow of
the stick tell across.
Since these kinds of circles that are-called (2) ____ did not work without [2] ____.
the sun, men had to find other ways to keep track of time, including a (3) ____. [3] ____.
candle on which each stripe took about one hour to melt, a water clock which had a
line with a number beside it for every hour and an (4) ____ which followed the [4] ____.
invention of glass blowing.
The first clock with a face and an hour hand was invented about 600 years ago
for few people. With the gradually (5) ____ use of clocks, they were beautiful- [5] ____.
ly (6) ____, though they could not keep correct time. Scarcely had clocks been [6] ____.
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