题目内容
The forecast of an earthquake is a big ____ to China as well as other countries.
A. distance B. challenge C. presentation D. design
B
阳光试卷单元测试卷系列答案I will never forget the two impressive things that happened last winter. One of my classmates and I were 36 our project work late at night on my university's campus far from home. Since there was 37 in the forecast, I had worn a winter 38 to school that day with a raincoat in my bag.
Throughout
our work on the project, I could 39 that my friend was tired from a very long day working. As we stepped outside to begin the 40 walk home, I 41 she was shivering(颤抖). The temperature had dropped to the low thirties (Fahrenheit) and she 42 had a swea
ter on. I 43 offered her my warm jacket. She accepted it and asked me what I 44 wear then. I told her I had another one and pretended that my 45 was a jacket. She said later that she 46 the next morning and the first thing on her mind was feeling moved about my 47 of the jacket.
Coincidentally(碰巧), the next day I went to an open-air play and I was freezing 48 I didn’t expect it to be so 49 . A person who I hardly 50 insisted that I wear his jacket. I was 51 touched by this warm gesture. He was so matter-of-fact(讲究实际的) about me 52 his coat, too: he simply took it off and handed it to me telling me that I should 53 it. I used to think that this vast universe was a cold 54 . It turns out that even when the temperature drops low, the people never 55 to warm each other's hearts.
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D
Wouldn't it be great if you could just look up at the sky and read the weather forecast right away?
Well, you CAN. The forecast is written in clouds. If you can read that writing, you can tell something about the atmosphere. With some practice, you can become a pretty good weather forecaster. Who knows, you might even do as well as meteorologists (气象学家).
Meteorologists use much more information than just the appearance of the clouds to make their forecast. They collect data from all over the world. Then they put it into powerful, high-speed computers.
This does give meteorologists an advantage, because they can track weather patterns as they move from west to east across the country.
But you have an advantage, too. You have your brains. You can look at the sky and get your data directly. A meteorologist uses a computer forecast that’s several hours old to make a local forecast.
What are you seeing when you look at a cloud? “A picture of what moisture (水气) is doing in the atmosphere,”says meteorologist Peter Leavit. There’s moisture throughout the atmosphere. Most of the time you don't see it, because it's in the form of an invisible gas called water vapor.
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 in 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, fol1owing each other in order, can signal an approaching storm. But don’t take our word for it; see for yourself.
53. According to the passage, ordinary people can tell the weather because __________.
| A. they can look up at the sky | B. they can read weather writings |
| C. information is stored in computers | D. clouds signal the weather to come |
| A. you can keep weather patterns in mind. |
| B. you have more powerful computers at home |
| C. your brain works as well as a high-speed computer |
| D. meteorologists give their data to you as soon as they get them |
| A. there are droplets in the air | B. light is scattered |
| C. moisture exists in the form of invisible gas | D. water vapor changes to liquid water |
| A. to become a weather forecaster | B. to collect data directly |
| C. to be an assistant to a meteorologist | D. to keep an eye on the weather |