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 will explain how the alarm works:
1. There is a power siren in the control unit. It makes a very loud noise.
2. Each of the small units sends out beams or rays in different directions. If anything moves, it breaks a beam. This sends signal to the control unit. The siren makes a noise which you can hear 50 meters away.
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 night I slept soundly because I was sure that no burglar could get into our house. However, at about 2:10 a. 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 down stairs 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 tamed on the light and 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 animals)(壁虎) disappear behind the curtains.
"Oh!" I said to myself. "That's our burglar.”
When the lizard moved, it started the siren. I guessed 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(强盗).
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 |
The writer used numbers 4, 9 and 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 |
The purpose of the three units was to_________.
A.sound their own siren when the control unit told them to |
B.send a message to the control unit and start the siren |
C.check that the control unit worked properly all the time |
D.give them enough light |
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 |
The purpose of the writer in writing the passage is to__________.
A.tell us that the alarm system doesn't work |
B.make it clear that he wants to give away his alarm system |
C.show us how the alarm system works |
D.tell us an interesting experience |