閱讀理解。
     Now satellites are helping to forecast  (預(yù)報(bào))  the weather. They are in space, and they can reach
 any part of the world.  The satellites take pictures of the atmosphere (大氣), because this is where the
weather forms  (形成). They send these pictures to the weather stations.  So meteorologists (氣象學(xué)家)  can see the weather of any part of the world. From the pictures, the scientists can often say 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 (比較) 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 say this.      
     So the 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 (提前) .
1. 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
2. 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 received satellite pictures              
D. when they study satellite pictures
3. Maybe we'll soon be able to forecast the weather  for _______.                
A. one day                
B. two days                
C. five days                
D.  seven days or even longer
4. 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 other work in many ways
D. weather forecasting
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