They are in space, and they can reach any part of the world. The 1______ take pictures of the atmosphere(大气), because this is where the weather forms(形成). They send these pictures to the 2______ station. So the scientists there can see the weather of any part of the world and tell how the weather will change.　　Today, nearly five hundred weather stations in sixty countries can 3______ satellite pictures. 4______ they receive the new pictures, they compare(比较)them with the earlier ones. Perhaps they may find that the clouds have 5______ during the last few hours. This may mean that the weather on the ground may soon change, too. In their next weather 6______, they can tell people about it. So the weather satellites are of a great 7______ to the scientists at the station. In the past they could forecast the weather for about 24 or 48 hours 8______. Now they can make good forecasts for three 9______ five days. Soon, perhaps, they may be able to forecast the weather 10______ a week or more ahead.

从括号中选择正确的词填空，使短文意思完整，必要时需改变词的形式。
(and, receive, satellite, weather, change, help, or, early, for, when, forecast, star)
　　Now satellites are helping to forecast(预报)the weather. They are in space, and they can reach any part of the world. The 1______ take pictures of the atmosphere(大气), because this is where the weather forms(形成). They send these pictures to the 2______ station. So the scientists there can see the weather of any part of the world and tell how the weather will change.
　　Today, nearly five hundred weather stations in sixty countries can 3______ satellite pictures. 4______ they receive the new pictures, they compare(比较)them with the earlier ones. Perhaps they may find that the clouds have 5______ during the last few hours. This may mean that the weather on the ground may soon change, too. In their next weather 6______, they can tell people about it. So the weather satellites are of a great 7______ to the scientists at the station. In the past they could forecast the weather for about 24 or 48 hours 8______. Now they can make good forecasts for three 9______ five days. Soon, perhaps, they may be able to forecast the weather 10______ a week or more ahead.