12．Professor’s Martin’s report suggests that 　　　　.

　　　 A．it may not be good for children to change schools too often

　　　 B．parents should not move around the country

　　　 C．the reason of children making slow progress is that they have changed schools

　　　 D．more and more children are mentally affected

11．The purpose of the writer in writing the passage is to 　　　　　　.

　　　 A．tell us that the alarm system doesn’t work

　　　 B．tell us an interesting experience

　　　 C．show us how the alarm system works

　　　 D．make it clear that he wants to give away his alarm system

D

Professor Martin’s report says that children who attend a number of different schools, because their parents have to move around the country, probably make slow progress in their studies. There are also signs, says Professor Martin, that an unusually large number of such children are mentally affected.

The professor says “It’s true, my personal feeling is that children should stay in one school. Our findings are based on research and not on any personal feelings that I or many assistants may have on the subject.”

Captain Thomas James, an Army lecturer for the past 20 years and himself a father of two, said, “I’ve never heard of such rubbish. Taking me for example, no harm is done to the education of my children, who change schools regularly--if they keep to the same system, as in our Army schools. In my experience--and I’ve known quite a few of them--Army children are as well adjusted as any others, if not more so. What the professor doesn’t appear to appreciate is the fact that in such situation children will adapt (适应) much better than grown-ups.”

When this was put to Professor Martin, he said that at no time had his team suggested that all children were backward or mentally affected in some way, but simply that in their experience there was a clear tendency (倾向性)。

“Our findings show that while the very bright children can deal with regular changes without harming his or her general progress in studies, the majority of children suffer from constantly having to enter a new learning situation”.

10．If the writer set the alarm and remained in the room for more than half a minute, 　　　　　.

　　　 A．nothing would happen　　　　　　　　　　　　　 B．the control unit would not work

　　　 C．the siren would make a noise　　　　　　　　 D．the dog would bark

9．The purpose of the three units was to 　　　　　.

　　　 A．send a message to the control unit and start the siren

　　　 B．sound their own sirens when the control unit told them to

　　　 C．check that the control unit worked properly all the time

　　　 D．give them enough light

8．The writer used numbers 4,9,1 to 　　　　　.

　　　 A．set the alarm system

　　　 B．make a telephone call

　　　 C．give numbers to each of the three units in the downstairs rooms

　　　 D．name his alarm system

7．The writer bought an alarm system to 　　　　.

　　　 A．make sure that he got up early every day

　　　 B．warn him when there were lizards in his house

　　　 C．frighten burglars and tell him that somebody had got into the house

　　　 D．make Mary feel safe to live in the large room

3.When we go to bed, I press the three buttons numbered 4,9 and 1. Then we have 30 seconds

　　　 to get out of the room before the alarm starts to work.

That might I slept soundly because I was sure that no burglar could get into our house. However, at about 2:10a.m., I woke up and heard the siren.

“There must be a burglar in the house,” Mary said. “What shall we do?”

“I’ll go and see who’s there,” I said. “Stay here. Don’t make a noise.”

I went downstairs quietly. When I reached the living-room, I switched on my torch and looked round the room. Then I turned the light on. I switched the siren off and searched the rooms downstairs. There was nothing wrong except that the back door was unlocked. I locked it, re-set the alarm and went back to bed.

About an hour later, the alarm started again. I jumped out of bed, fell over a chair in the dark and bumped into the bedroom door. Mary woke up and started hitting me with a torch. “Hey! Wait a minute!” I whispered. “It’s only me. I’ m going downstairs to see what’s wrong.”

I went down into the living-room and listened for a moment. The only sound I could hear was the siren. I turned on the light and then switched the siren off. As I did so, I glanced across at the curtains in front of the windows. I saw a house lizard (a kind of small animal) disappear behind the curtains.

“Oh!” I said to myself. “That’s our burglar.”

When the lizard moved, it started the siren. I guessed that the alarm had been made in Europe, where there are no house lizards.

Well, I won’t finish this story but if you want an alarm system free of charge, let me know. I’ll send you ours. We bought a dog this morning. It knows the difference between a lizard and a burglar.

2.Each of the small units sends out beams or rays in different directions. If anything moves, it

　breaks a beam. This sends a signal to the control unit. The siren makes a noise which you can

　hear 50 meters away.

1.There is a power siren in the control unit. It makes a very loud noise.

6．Which of the following is true?

　　　 A．If there is hot and melted rock, there will be a volcano.

　　　 B．A mountain is formed when the hot and melted rock pushes out.

　　　 C．A volcano is like a tube of toothpaste.

　　　 D．A mountain is formed when the melted rock below the Earth’s crust flows.

C

Last week, I bought an alarm system for about $ 450. It consisted of a control unit with three small units. I put the control unit in the sitting-room and fastened the other units by the front door, back door and living-room windows. The instructions told us to choose three numbers, so we chose 491, the last three numbers of our telephone number.

Now I must explain how the alarm works: