题目内容
E
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.
Meteorologists use much more information than just the appearance of the clouds to make their forecasts. 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 can look at the sky and get your data directly. A meteorologist uses a computer forecast that takes several hours to make a local forecast.
What are you seeing when you look at a cloud? “A picture of what moisture is doing in the atmosphere,” says meteorologist Peter Leavitt. There’s moisture throughout the atmosphere. Most of the time you don’t see it ,because it’s in the form of an unseen gas called water vapor.
Sometimes, the temperature of the air gets cold enough to cause the water vapor to change into liquid water. That’s called condensation, and we see it happen all the time(for example, when damp air hits the cold glass of a mirror). When enough water vapor condenses, tiny drops form in the air. These drops spread 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 a coming storm. But don’t take our word for it; see for yourself.
57．This passage mainly tells us about how to_______.
A．become a meteorologist B．keep an eye on the weather
C．be an assistant to a meteorologist D．change water vapor into liquid water
58．According to the passage, ordinary people might do as well as meteorologists in weather forecast________.
A．with the help of the high-speed computers
B．through a complex process of calculation
C．with simple practice looking up at the sky
D．asking for information from weather station
59．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
60．What causes vapor to change into water?
A．A lot of moisture. B．Thick clouds.
C．Warm atmosphere. D．Cold air temperature.
57-60 BCCD
优加精卷系列答案Read the following text and choose the most suitable heading from A-F for each paragraph. There is one extra heading which you do not need.
|
76.
The use of health supplements such as multivitamin tablets has increased greatly in the western world. People take these supplements because advertising suggests that they prevent a range of medical conditions from developing. However, there is concern that people are consuming worryingly high doses of these supplements and the European Union (EU) has issued a directive that will ban the sale of a wide range of them. This EU directive should be supported.
77.
Research suggests that people who take Vitamin C supplements of over 5000 milligrams a day are more likely to develop cancer. This shows how much damage these health supplements do to people’s health. A spokesman for the health supplement industry has argued that other research shows that Vitamin C supplements help prevent heart disease, but we can dismiss this evidence as it is from a biased source.
78.
Science fiction of the 1960s and 1970s predicted that pills would replace meals as the way in which people would get the fuel they needed. This, it was argued, would mean a more efficient use of time as people wouldn’t have to waste it preparing or eating meals. The EU directive would help prevent this nightmare of pills replacing food becoming a reality.
79.
People already take too many pills instead of adopting a healthier lifestyle. For example, the consumption of painkillers in Britain in 1998 was 21 tablets per year for every man, woman and child in the country. People do not need all these pills.
80.
Some might argue that the EU directive denies people’s right to freedom of choice. However, there are many legal examples for such intervention when it is in the individual’s best interests. We now make people wear seatbelts rather than allowing them to choose to do so. Opposing the EU directive would mean beneficial measures like this would be threatened.