In the Middle Ages the weight falling speed of a clock was kept by . A. several bowls B. a system o——青夏教育精英家教网—

摘要：In the Middle Ages the weight falling speed of a clock was kept by . A. several bowls B. a system of wheels C. a system of pendulum D. several springs D When several different people look at the same person, it is not unusual for each of them to see different things; when you alone observe one behavior or one person at two different times, you may see different things. The following are but some of the factors that lead to these varying perceptions: Each person’s perceptions of others are formed by his or her own cultural conditioning, education, and personal experience. Sometimes perceptions differ because of what we choose to observe and how we deal with what we’ve observed. It is not necessarily true that person’s perception is based on observations of a particular person. Your observations may be totally controlled by some. Your observations may be totally controlled by what others have told you about this person; or you may focus primarily on the situation or role relationship. Most people do not use the same yardstick to measure their parents, their friends, and strangers. Sometimes we see only what we want to see what may be obverse to others because of our own needs, desires, or temporary emotional states. This is a process known as selective perception. Selective perception is obviously more difficult when contradictory information is particularly obvious, but it can be done. We can ignore the stimulus-“He’s basically a good boy, so what I saw was not shoplifting. We can reduce the importance of the contradictory information-“All kids get into mischief. Taking a book from the bookstore isn’t such a big deal. We call change the meaning of the contradictory information-“It wasn’t shoplifting because he was going to pay for it later. ...

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Thousands of years ago people guessed the time of day by watching the sun.

Later，they found it was easier to tell the exact time by looking at the shadows.Thus， the sundial(日晷) was invented.

The sundial proved a useful timepiece in sunny weather. However，another typc of timepiece was necessary for cloudy weather and nigh time.A sand glass was another common measurer of time.Two glass bottles were connected by a very small opening. The top bottle was filled with sand，which dropped slowly into the botton one in a certain period of time.Hour glasses were widely used then.Three—minute sand glasses are still used in many homes to time the boiling of eggs.

The real ancestor of modern clocks was the water clock.In China ,an early 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.

9.Which of the following is the correct picturr of a sand glass?

A. B. C. D.

10.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

11.If you visit Beijing Palace Museum, you .

A.will see the old water clocks broken

B.will find the time shown by the old water clocks is wrong

C.can find the old water clocks still telling the time there

D.will find the old water clocks have gone

12.In the Middle Ages the weight falling speed of a clock was kept by .

A.several bowls B.a system of wheels

C.a system of pendulum D.several springs

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