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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