Now satellites are helping to forecast the weather. They are in space, and they can reach any part of the world. The satellites take pictures of the atmosphere（大气）, because this is where the weather forms. They send these pictures 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 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 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.Satellites travel _____________.

A．in space          B．in the atmosphere   C．above the ground   D．above space

2.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 in the atmosphere there

C．the weather forms in the atmosphere        D．the pictures can forecast the weather

3.Meteorologists forecast the weather __________.

A．when they have received satellite pictures

B．after comparing the pictures with earlier ones

C．before they received satellite pictures

D．while they study satellite pictures

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 to the pictures

Now satellites(卫星)are helping to forecast the weather. They are in space and they can reach any part of the world. The satellites take pictures of the atmosphere(大气), because this is where the weather forms(形成). They send these pictures to the weather station. So meteorologists(气象专家)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(比较)them with earlier ones. Perhaps they may find that the clouds have changed during the last few hours .This may mean 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 3 or 5 days. Soon, perhaps , they may forecast the weather for a week or more ahead(提前)

1.Satellites travel__________.

2.Why do we use the weather satellites to take pictures of the atmosphere? Because___________.

3.Meteorologists forecast the weather________.

4.Maybe we’ll soon be able to forecast the weather for _______.

5.The main idea of this passage is that satellite is now used in______.