题目内容

听力原文: Snow is a subject of great interest to weather experts. Experts sometimes have difficulty estimating where, when or how much snow will fall. One reason is that heavy amounts of snow fall in surprisingly small areas. Another reason is that a small change in temperature can mean the difference between snow and rain.
Snow falls in extreme northern and southern areas of the world throughout the year. However, the heaviest snowfalls have been reported in the mountains of other areas during winter. These areas include the Alps in Italy and Switzerland, the coastal mountains of western Canada, and the Sierra Nevada and Rocky Mountains in the United States. In warmer climates, snow is known to fall in areas over four thousand nine hundred meters above sea level.
Snow can be beautiful to look at, but it can also be dangerous.
Snow is responsible for the deaths of hundreds of people in the United States every year. Many people die in traffic accidents on roads that are covered with snow or ice. Others die from being out in the cold or from heart attacks caused by extreme physical activity.
A few years ago, a major storm caused serious problems in the eastern United States. It struck the Southeast in January 1996, before moving up the East Coast. The storm was blamed for more than one hundred deaths. It forced nine states to declare emergency measures.
Virginia and West Virginia were hit hardest. In some areas, snowfall amounts were more than one meter high. Several states limited driving to emergency vehicles. Most major airports were closed for at least a day or two.
A week later, two other storms brought additional snow to the East Coast. In the New York City area, the added weight of the snow forced the tops of some buildings to collapse. Many travelers were forced to walk long distances through deep snow to get to train stations.
People may not be able to avoid living in areas where it snows often. However, they can avoid becoming victims of winter snowstorms.
People should stay in their homes until the storm has passed. While removing large amounts of snow, they should stop and rest often. Difficult physical activity during snow removal can cause a heart attack. It is always a good idea to keep a lot of necessary supplies in the home even before winter begins. These supplies include food, medicine, clean water, and extra power supplies.
Some drivers have become trapped in their vehicles during a snowstorm. If this happens, people should remain in or near their car unless they see some kind of help. They should get out and clear space around the vehicle to prevent the possibility of carbon monoxide gas poisoning.
People should tie a bright-colored object to the top of their car to increase the chance of rescue. Inside the car, they should open a window a little for fresh air and turn on the engine for ten or fifteen minutes every hour for heat.
People living in areas with winter storms should carry emergency supplies in their vehicles. They should include food, emergency medical supplies, and extra clothing to stay warm and dry. People in these areas should always be prepared for winter emergencies.
(56)

查看答案
更多问题

在初始序列已基本有序(除去n个元素中的某k个元素后即呈有序,k$amp;

Some believe intelligence is a decisive factor for success, whereas others believe diligence is more important. What is your opinion?
Write on ANSWER SHEET TWO a composition of about 200 words on the following topic:
INTELLIGENCE AND DILIGENCE
You are to write in three parts :
In the first part, state your point of view.
In the second pan, give one or two reasons to support your point of view.
In the last part, bring what you have written to a natural conclusion,
Marks will be awarded for content, organization, grammar and appropriateness. Failure to follow the 'instructions may result in a loss of marks.

Sleepless at Night
It was a normal summer night. Humidity (湿气) hung in the thick air. I couldn&39;t go to sleep,partly because of my cold and partly because of my expectations for the next day. My mum had said that tomorrow was going to be a surprise.
Sweat stuck to my aching body. Finally, I gathered enough strength to sit up. I looked out of my small window into the night. There was a big bright moon hanging in the sky, giving off a magic light.
I couldn&39;t stand the pressure anymore, so I did what I always do to make myself feel better. I went to the bathroom and picked up my toothbrush and toothpaste. I cleaned my teeth as if there was no tomorrow. Back and forth, up and down.
Then I walked downstairs to look for some signs of movement, some life. Gladiator, my cat frightened me as he meowed (喵喵地唱出 ) his sad song. He was on the old orange couch (长沙发), sitting up on his front legs, waiting for something to happen. He looked at me as if to show"I&39;m lonely, pet me. I need a good hug (紧抱 ) .”Even the couch begged me to sit on it.
In one movement I settled down onto the soft couch. This couch represented my parents&39; marriage, my birth, and hundreds of other little events.
As I held Gladiator, my heart started beating heavily. My mind was flooded with questions:What&39;s life? Am I really alive? Are you listening to me? Every time I moved my hand down Gladiator&39;s body, I had a new thought; each touch sang a different song.
I forgot all about the heat and the next day&39;s surprise. The atmosphere was so full of warmth and silence that I sank into its arms. Falling asleep with the big cat in my arms, I felt all my worries slowly move away.
The author of the passage could not go to sleep partly because__________. 查看材料

A. it was too cold
B. it was too dry
C. he had a cold
D. he had a fever

Emerging evidence is painting a very different scenario, one in which rising temperatures could benefit millions of Africans in the driest parts of the continent. Scientists are now seeing signals that the Sahara desert and surrounding regions are greening due to increasing rainfall. If sustained, these rains could revitalize drought-ravaged regions, reclaiming them for farming communities. This desert-shrinking trend is supported by climate models, which predict a return to conditions that turned the Sahara into a lush savanna some 12,000 years ago.
The green shoots of recovery are showing up on satellite images of regions including the Sahel, a semi-desert zone bordering the Sahara to the south that stretches some 2,400 miles.
Images taken between 1982 and 2002 revealed extensive regreening throughout the Sahel, according to a new study in the journal Biogeosciences. The study suggests huge increases in vegetation in areas including central Chad and western Sudan. The transition may be occurring because hotter air has more capacity to hold moisture, which in turn creates more rain, said Martin Claussen of the Max Planck Institute for Meteorology in Hamburg, Germany, who was not involved in the new study. "The water-holding capacity of the air is the main driving force," Claussen said.
While satellite images can't distinguish temporary plants like grasses that come and go with the rains, ground surveys suggest recent vegetation change is firmly rooted. In the eastern Sahara area of southwestern Egypt and northern Sudan, new trees—such as acacias—are flourishing, according to Stefan Kr?pelin, a climate scientist at the University of Cologne's Africa Research Unit in Germany.
"Before, there was not a single scorpion, not a single blade of grass," saidKr?pelin, who has studied the region for two decades."Now you have people grazing their camels in areas which may not have been used for hundreds or even thousands of years. You see birds, ostriches, gazelles coming back, even sorts of amphibians coming back," he said."The trend has continued for more than 20 years. It is indisputable."
An explosion in plant growth has been predicted by some climate models.For instance, in 2005 a team led by Reindert Haarsma of the Royal Netherlands Meteorological Institute in De Bilt, the Netherlands, forecast significantly more future rainfall in the Sahel.The study in Geophysical Research Letters predicted that rainfall in the July to September wet season would rise by up to two millimeters a day by 2080.
Satellite data shows "that indeed during the last decade, the Sahel is becoming more green," Haarsma said.Even so, climate scientists don't agree on how future climate change will affect the Sahel: Some studies simulate a decrease in rainfall."This issue is still rather uncertain," Haarsma said.
Max Planck's Claussen said North Africa is the area of greatest disagreement among climate change modelers.Forecasting how global warming will affect the region is complicated by its vast size and the unpredictable influence of high-altitude winds that disperse monsoon rains, Claussen added."Half the models follow a wetter trend, and half a drier trend."
86. According to the first paragraph, global warming is supposed to have the following impacts on Africa EXCEPT

A. water deficiency
B. distress
C. desertifications
D. more grasses and lakes

答案查题题库