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发布时间：2006-07-02 04:33     点击：

Sometimes, the temperature of the air gets cold enough to cause the water vapor to change to liquid water. That’s called condensation, and we see it happen all the time (for example, when humid air from the shower hits the cold glass of a mirror). When enough water vapor condenses, droplets form inn the air. These droplets scatter light. A cloud is seen.

Watching clouds over a day or two tells you a lot more than a single cloud about the weather to come. Changes in clouds show changes in the atmosphere.

You should begin to notice patterns. Certain clouds. following each other in order. Can signal an approaching storm. But don’t take our word for it; see for yourself.

49. This passage mainly tells us about how .

A. to become a meteorologist

B. to keep an eye on the weather

C. to be an assistant to a meteorologist

D. to change water vapor to liquid water

50. According to the passage, an ordinary person might do as well as a meteorologist in weather forecast .

A. with the help of the high-speed computers

B. through a complex process of calculation

C. with some simple practice looking up at the sky

D. consulting a weather station

51. Meteorologists make their weather forecast .

A. by collecting data from all over the world

B. by putting this date into powerful, high-speed computers

C. by calculating and analyzing this data

D. all above

52. Your advantage in weather forecasts is that .

A. you have more powerful computers at home

B. your brain works as well as a high-speed computer

C. you observe the sky and obtain your data directly

D. meteorologists give their data to you as soon as they get them

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