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4.Many i________ have changed our life greatly,such as TV and washing machines.

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3.Teenagers under 18 years old shouldn’t be a________ to drive cars.

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2.The thief d________ in the darkness soon,so we couldn’t catch him.

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1.Darning,Let’s go u________ to the second floor,OK?

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    Now satellites are  31  to forecast(预报)the weather.They are in space,and they can  32  any part of the world.The satellites take pictures of the atmosphere(天气) ,  33  this is where the weather forms(形成) .They send these   34  to the weather stations.So meteorologists(气象学家)can see the weather of any part of the world.From the pictures,the scientists can often say  35  the weather will change.

    Today,nearly five hundred weather stations in sixty countries receive satellite pictures.When they receive new pictures,the meteorologists compare them with earlier  36  .Perhaps they may find that the clouds have changed during the last few hours.This may mean that the  37  on the ground may soon change,too.In their next weather forecast,the meteorologists can say this.

    So the weather satellites are a great  38  to the meteorologists.  39  satellites were invented,the scientists could forecast the weather for about 24 or 48 hours.Now they can make good forecasts for three or five days.Soon,perhaps,they may  40  forecast the weather for a week or more ahead(提前).

31.A.help             B.to help           C.helped           D.helping

32.A.reach            B.arrive            C.get             D.go

33.A.so              B.because          C.even            D.but

34.A.satellites          B.pictures          C.weather          D.space

35.A.that             B.for             C.where           D.how

36.A.it               B.one             C.ones            D.them

37.A.clouds           B.weather          C.pictures          D.trees

38.A.report           B.luck             C.helpful           D.help

39.A.Before           B.After            C.Since            D.If

40.A.can             B.be              C.be able to         D.could

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