water clock was made up of several bowls. Water trickled(滴) from one bowl to another to keep the clock
going. Visitors to the
Beijing Palace Museum can still see the old
water clocks showing the time there.
In the Middle Ages a wateless clock was invented which
worked by means of
weights. To keep
the
weight
falling
at
the
same
speed,a
system
of wheels
was
invented. The pendulum(钟摆) was
soon
developed
to control
the
speed of the
wheels. Thus the modern form of clock came into being.
64.Which of the following is the correct picturr of a sand glass?
A.
B.
C.
D.
65.Three minute sand glasses are still used in many homes
.
A.to boil eggs
B.to measure the time of boiling eggs
C.to hold the boiled eggs
D.to have eggs boiled
66.If you visit Beijing Palace Museum, you
.
A.will see the old water clocks broken
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