阅读理解
Last week, I bought an alarm system(报警系统)for about $ 450.It consisted of a control unit with three other 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:
1.There is a power siren(警报器)in the control unit.It makes a very loud noise.
2.Each of the small units sends out rays in different directions.If anything moves, it breaks a beam.This sends a signal to the control unit.The siren makes a noise that 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 might I slept soundly because I was sure that no burglar(夜贼)could get into our house.However, at about 2:10a.m., I woke up and heard the siren(警报).
“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(蜥蜴)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.
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