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 |
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C
Jiang Nan, a full-time mother in Beijing, keeps a dozen or so cloth bags at home, carefully selecting one or two before heading out to get groceries. “Most of them were giveaways from advertising marketing campaigns, but
others had been handed out in the street by various environmental protection organizations,” she explained.
Since June 2008 China has forbidden the production,
sale and usage of plastic bags thinner than 0.025 millimeter (毫米), and retailers(零售商) are not allowed to provide free plastic bags to their customers, regardless of the thickness.
Many Chinese consumers like Jiang have learned to refuse plastic bags whenever possible in their shopping. “A plastic bag may only cost a few jiao, but it’s more about how bad they are for the environment,” Jiang said.
The plastic ban is for the most part well carried out in big cities, and has been distinctly effective in reducing white waste. On the first anniversary of the plastic ban Global Village of Beijing, an NGO environmental organization, shows that during the year of the ban the consumption of plastic bags fell by about 40 billion pieces in chain supermarkets alone, saving more than 1.2 million tons of petroleum.
However, enforcement shows considerably less muscle in smaller cities, towns and country-
side. In a remote town like Lichuan, the awareness of environmental protection is not as strong as that in big cities. Street vendors(街头小贩) worry that they are likely to lose customers if they charge them for plastic bags. Seeing no significance in the issue, local government often turn a blind eye to banned bag traffic in the market.
There are still those who don’t have an interest in living green. Cui Lin, another Beijinger, often forgets to bring a cloth bag when shopping, and has to buy plastic bags. “Anyway I think plastic bags are neater and cleaner, and I don’t mind paying a couple more jiao,” he shrugged.
Mrs Yu, a vegetable vendor in Lichuan County, Jiangxi Province, recalled that before plastic bags became popular in the early 1990s, Chinese people always carried a bamboo basket when they visited the market. “Plastic bags are more convenient,” she comments, and her view might be that of the tens of millions of people in the nation who still cling to plastic bags, paid or free. This is suggested by her trade where piles of plastic bags are still passed out every day.
49. In Paragraph 1, the writer uses Jiang Nan’s case to __________.
| A. introduce a topic | B. tell a story |
| C. describe a person | D. offer an argument |
| A. She bought them at a low price. C. She borrowed them from her relatives. | B. She got them for free. D. She made them herself. |
| A. Cloth bags are difficult to get and heavy to carry. |
| B. People’s awareness of environmental protection is not strong enough. |
| C. People don’t mind paying a couple more jiao for plastic bags. |
| D. Street vendors worry that they are likely to lose customers if they charge them. |
| A. To reduce white waste is urgent. |
| B. The plastic bag ban has achieved great success. |
| C. There is still a long way to go for the plastic bag ban. |
| D. People’s awareness of environmental protection should be stressed. |