B

　　Now satellites are helping to forecast(預報)the weather.From space,they can see any part of the earth.These satellites take pictures of the atmosphere(大氣),because this is where the weather forms.These pictures are sent to weather stations on earth.Meteorologists(氣象學家)can see the weather of any part of the world.From the pictures,the scientists can often see how 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 ones.Perhaps they may find that the clouds have changed during the last few hours.This may mean that the weather on the ground may soon change,too.In their next weather forecast,the meteorologists can report this.

　　So weather satellites are a great help to the meteorologists.Before 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 be able to forecast the weather for a week or more ahead.

　　39.Satellites travel__________.

　　A.in space

　　B.in the atmosphere

　　C.above the ground

　　D.above space

　　40.Why do we use the weather satellites to take pictures of the atmosphere?Because__________.

　　A.the weather satellites can do it easily

　　B.clouds form there

　　C.the weather forms there

　　D.the pictures can forecast the weather

　　41.Meteorologists forecast the weather__________.

　　A.when they have received satellite pictures

　　B.after they have compared new satellite pictures with earlier ones

　　C.before they receive satellite pictures

　　D.during they study of satellite pictures

　　42.The main idea of this passage is that satellites are now used in__________.

　　A.taking pictures of the atmosphere

　　B.receiving pictures of the atmosphere

　　C.doing many other types of work

　　D.weather forecasting

　　39.【答案】A

　　【解題指要】本題是細節(jié)題。題干問的是：衛(wèi)星的活動范圍是什么?從文章的內(nèi)容來看，衛(wèi)星是在太空里活動，因此本題選擇A。

　　40.【答案】C

　　【解題指要】本題是細節(jié)題。題干問的是：我們?yōu)槭裁蠢脷庀笮l(wèi)星獲取大氣層的圖片。A是說氣象衛(wèi)星能很容易地獲取圖片。B說云層在大氣層里形成。C是說天氣變化在大氣層里形成。D是說這些圖片可以預測天氣變化。從文中第一段中間的文字來看，作者明確指出，我們利用氣象衛(wèi)星獲取大氣層的圖片是因為，天氣變化在大氣層里形成，故本題選擇C。

　　41.【答案】B

　　【解題指要】本題是細節(jié)題。題干問的是：氣象學家什么時間預報天氣狀況?A是說當他們接收到衛(wèi)星圖片時。B是說在他們將新的衛(wèi)星圖片和以前的衛(wèi)星圖片做過比較之后。C是說在他們接收衛(wèi)星圖片之前。D是說在他們研究衛(wèi)星圖片的時候。根據(jù)文章內(nèi)容，本題選擇B。

　　42.【答案】D

　　【解題指要】本題是歸納推理題。題干問的是：本文的中心思想是衛(wèi)星用于什么?A說衛(wèi)星被用于獲取大氣層的圖片。B是說衛(wèi)星被用于接收大氣層的圖片。C是說在很多方面做一些其他工作。D是說衛(wèi)星用于天氣預報。

　　【短文C：文章大意】

　　短文介紹了美國大學里的足球運動。

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