三、概括大意(共1题，合计8分)
阅读下面这篇短文，短文后有2项测试任务：(1)第23～26题要求从所给的6个选项中为第1、3、4、6段每段选择1个正确的小标题;(2)第27～30题要求从所给的6个选项中选择4个正确选项，分别完成每个句子。请将答案涂在答题卡相应的位置上
Alaska
1 In 1868 Americans welcomed Alaska into the Union as the 49th state, symbolizing a change of attitude from that held in 1867 ,when the peninsula was purchased from Russia. Then, most Americans had little interest in 1,500,000 square kilometers “of icebergs and polar bears”—beyond Canada's western borders, far from the settled areas of the United States.
2 In those sections of the state which lie abwww.med126.comove the Arctic Circle, Alaska still is a land of icebergs and polar bears. Ice masses lie buried in the earth, which is permanently frozen to a depth of 90 or more meters. From early May until early August, the midnight sun never sets on this flat, treeless region, but the sun cannot melt the icy soil more than two-thirds of a meter down.
3 Alaska is America's largest state, but only about 325,000 people live there. According to estimates, 800,000 hectares of its land area are fit for plowing but only about 640,000 hectares are being cultivated.
4 Arctic Alaska has been the home of Eskimos for countless centuries. It is believed that the Eskimos moved there from Mongolia or Siberia, probably crossing Bering Strait, named for Vitus Bering, the Danish sea captain who discovered Alaska on his voyage for Russia in 1741. The Eskimos are the state's earliest known inhabitants. Russian fur traders established settlements but, by the time Alaska was sold to the United States, most of the traders had departed.
5 In 1896 gold was discovered near the Klondike River in Canada just across the Alaskan border. Thousands of Americans rushed to the region on their way to Klondike; some never returned. Alaska was never completely cut off again, although even today transportation is a major problem. There are only two motor routes from the U. S. mainland, and within the state, every town has its own airfield. Planes fly passengers, mail and freight to the most distant villages.
6 The gold that changed life so suddenly for Alaska was soon ended, and although many stories about mining camps have become part of American literature, the gold from Alaskan earth contributed less to economic progress than the fish from Alaskan waters. The fish caught in a single year range in value from $ 80 million to $ 90 million. Fur-bearing animals are plentiful in the forests and streams, and valuable fur seals inhabit the waters. After fishing, the state's chief industry is lumber and the production of wood pulp. In recent years, Alaska's single most important resource has become oil. The state also has large deposits of coal, copper, gold and other minerals.
23Paragraph 3 _________
24Paragraph 4 _________
25Paragraph 5 _________
26Paragraph 6 _________
A Rich resources of the state
B Connections with the outside world
C Transportation problem
D The natives of the land
E Cold climate
F Land and population
27For as long as three months of a year, the sun _________on the ice-covered land of Alaska.
28According to statistics, _________of the total area of Alaska has been used for farming.
29Alaska was originally part of Russia, but was bought _________
30Gold did not bring to Alaska as much wealth _________ A as fish does
B because of its rich natural resources
C by the United States in the 19th century
D shines day and night
E only a very small percentage
F a limited amount of the gold found there
四、阅读理解(共3题，合计45分)
短文后有5道题，每题后面有4个选项。请仔细阅读短文并根据短文回答其后面的问题，从4个选项中选择1个最佳答案涂在答题卡相应的位置上。
Newspapers often tell us of floods in some parts of the United States.
Nearly every year on the great central dr医.学全.在.线网站www.med126.comainages heavy rains and melting snow cause the waters to pour out the mountains and plains, to turn brooks into torrents, and to swell quiet streams into wild uncontrolled rivers. From Cairo to New Orleans, and from Pittsburgh to Paducah, the cry "River rising!" is a familiar yet fearful voice. . . When the rivers sometimes become too high or too swift to be controlled communities are flooded, families flee from their homes, croplands are washed out, and transportation comes to a halt. Hunger, disease, and death follow the wild waters.
Although given less publicity, the agricultural damage done by the many smaller, more frequent floods usually far exceeds the losses caused by the very grand ones. In the Central States, ditches and drains cause the flows from spring rains and melting snow to run far more rapidly than in the days before white men settled on the land. Once, excess spring flood waters emptied into lakes and swampy lands, there to be detained for slow release into stream and rivers. Now, systematic drainage has actually eliminated these natural reservoirs.
In the more rolling sections of the East, spring runoff was formerly absorbed and held temporarily in the porous soils beneath the unbroken expanse of forest. When large areas were converted to farm use, removal of the forest and the practice of up-and-down hill plowing deprived the soils of much of their ability to catch and store water.
The effects of eliminating the natural forest cover are shown in the gullied farm lands and widened stream channels found in some densely settled areas. Partly because the stream channels are more or less filled with material washed down from the uplands, and partly because storm runoff has increased, the channels are today no longer able to carry all the flow from heavy rains. This explains why the streams overtop banks far more often than in the days before settlement.
31 The best title for the selection would be______.
A. River Rising! River Rising!
B. Forests and Floods
C. Flooding in the U. S.
D. The Results of Flooding
32 All of the following cause floods EXCEPT______.
A. heavy rain
B. melting snow
C. increasing storm runoff
D. porous soil
33 The author states that______.
A. lakes and swamps once acted like natural reservoirs
B. up-and-down hill plowing catches and stores water
C. stream channels are the best carriers of water
D. floods are easily prevented and controlled
34According to the selection, streams overtop their banks partly because______.
A. material from higher land is washed into them
B. ditches and drains lead into them
C. rivers become too swift
D. snow melts more rapidly nowadays
35The floods which are given most publicity______.
A. cause no damage
B. cause the most damage
C. cause less agricultural damage than the many smaller, more frequent floods
D. far exceed the smaller, more frequent floods in agricultural loss
Mobile Phone and Diseases
A study by scientists in Finland has found that mobile phone radiation can cause changes in human cells that might affect the brain, the leader of the research team said.
But Darius Leszczynski, who headed the 2-year study and will present findings next week at a conference in Quebec(魁北克), said more research was needed to determine the seriousness of the changes and their impact on the brain or the body.
The study at Finland's Radiation and Nuclear Safety Authority found that exposure to radiation from mobile phones can cause increased activity in hundreds of proteins in human cells grown in a laboratory, he said.
“We know that there is some biological respo医.学全.在.线网站www.med126.comnse. We can detect it with our very sensitive approaches, but we do not know whether it can have any physiological effects on the human brain or human body,” Leszczynski said.
Nonetheless the study, the initial findings of which were published last month in the scientific journal Differentiation, raises new questions about whether mobile phone radiation can weaken the brain's protective shield against harmful substances.
The study focused on changes in cells that line blood vessels and on whether such changes could weaken the functioning of the blood-brain barrier, which prevents potentially harmful substances from entering the brain from the bloodstream, Leszczynski said.
The study found that a protein called hsp27 linked to the functioning of the blood-brain barrier showed increased activity due to irradiation and pointed to a possibility that such activity could make the shield more permeable(能透过的), he said.
“Increased protein activity might cause cells to shrink—not the blood vessels but the cells themselves—and then tiny gaps could appear between those cells through which some molecules could pass. ” he said.
Leszczynski declined to speculate on what kind of health risks that could pose, but said a French study indicated that headache, fatigue and sleep disorders could result.
“These are not life-threatening problems but can cause a lot of discomfort,” he said, adding that a Swedish group had also suggested a possible link with Alzheimer's disease.
“Where the truth is do not know,” he said.
Leszczynski said that he, his wife and children use mobile phones, and he said that he did not think his study suggested any need for new restrictions on mobile phone use.
36According to Leszczynski, how does mobile phone affect one's health? _________
A Mobile phone radiation can increase protein activities and such activities can make the protective shield more permeable.
B Mobile phone radiation can shrink the blood vessels and prevent blood from flowing smoothly.
C Mobile phone radiation will bring stress to people exposed to it.
D Mobile phone radiation kills blood cells at a rapid speed.
37What's the result of the French study? _________
A The harm of mobile phone radiation is life-threatening.
B Mobile phone may affect one's normal way of thinking.
C Sleep disorders could result from mobile phone radiation.
D A protein called hsp27 is killed by mobile phone radiation.
38What kind of disease is not caused by the use of mobile phone? _________
A Fatigue.
B Headache.
C Alzheimer's disease.
D Tuberculosis.
39According to the passage, what would be the future of the use of mobile phone? _________
A People will be forbidden to use mobile phone.
B People dare not use mobile phone because of its radiation.
C People will continue to use mobile phone.
D There will be new restrictions on the use of mobile phone.
40Which of the following is NOT true according to the passage? _________
A The research in Finland found that mobile phone radiation will affect one's brain.
B Mobile phone radiation can cause increased activity in hundreds of protein in human cells.
C Increased protein activity might cause cells to shrink.
D Lszczynski forbid his wife and children to use mobile phone after his research.
