题目内容：
根据材料，回答问题。A
Now satellites are helping to forecast the weather．They are in space，and they can reach any Dart of the world．The satellites take pictures of the atmosphere，because this is where the weather form．They send these pictures to the weather stations． So meteorologists 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 them with earlier ones．Perhaps they may find that the clouds haye changed during the last few hours．This may mean that the weather on the gmund may soon change，too．In their next weather forecast，the meteorologists can say this.
So the weather satellites are a great help to tlle meteorologists．Before satellites were invented，the scientists could forecast the weather for about 24 0r 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.
Satellites travel_________． A．in space
B．in the atmosphere
C．above the ground
D．above space
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