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1916，and it is one of the most recognizable buildings in Canada.
Downtown Ottawa is the commercial and economic centre of the city. Most of the buildings are office towers. While most of Ottawa’s high tech industry is based elsewhere， it has a significant presence in the downtown core. The downtown also contains a number of apartments， hotels， and the older single family homes and townhouses along its edges.
The National Gallery of Canada is one of Canada’s premier art galleries. The Gallery has a large and varied collection of paintings， drawings， sculpture and photographs. Although its focus is on Canadian art， it also holds works by some noted American and European artists.
The Rideau Canal is the oldest continuously operated canal system in North America. At the very beginning，the purpose of the Rideau Canal was military， as it was intended to provide a secure supply and communication route between Montreal and the British naval base in Kingston. It remains in use today primarily for pleasure boating， with most of its original structures undamaged. The locks on the system open for navigation in mid-May and close in mid-October.
60. What does ”iteration” probably mean in the 2nd paragraph? _____.
A. repair B. copy C. design D. landmark
61. In the core of Downtown Ottawa， we could see _____.
A. a large number of tall towers
B. a number of apartments and hotels
C. head offices of Ottawa’s high tech industry
D. the older single family homes and townhouses
62. Collections in the National Gallery of Canada are mainly _____.
A. paintings and drawings B. sculpture and photographs
C. artwork by Americans and European D. works by Canadian artists
63. Which of the following is true about the Rideau Canal? _____.
A. It was originally for the military purpose
B. It is the oldest canal system in North America
C. The original structures remain never changed
D. People can only go boating from May to October
C
April 11， 2003 12:44 a. m. PST， Associated Press
The respiratory(呼吸系统)virus known as SARS has appeared to spread in the United States only to family members of health workers with close contact to a sick person.
On Thursday， the head of the Centers for Disease Control and Prevention said there might be a case of severe acute respiratory syndrome（综合症）spreading through the workplace.
Dr. Julie Gerberding said a suspected SARS virus patient who became ill after traveling to Asia might have infected a co-worker in Florida， which made her “very worried”.
So far， a dozen people—nine family members and three health workers—were infected after coming into close contact with the person with SARS. The rest of the 166 suspected American cases have something to do with people who were infected while traveling in Asia.
In the Gainesville， Fla. area， a 47-year-old woman was believed to have been infected at work by a 60-year-old woman who was the nation’s first suspected SARS case， said Tom Belcuore， director of the AlachuaCounty health department.
Since the World Health Organization announced a worldwide warning last month about SARS， the United States has started infection control in hospitals and among families of suspected cases.
Florida officials said a school in OkaloosaCounty went through a cleaning after a 6-year-old boy suspected of having SARS appeared at school with slight symptoms. “Health officials are watching the boys’ contacts at school to make sure no one else is infected，” said Rob Hayes， health department spokesman， “The boy may have been infected from a family member，” Hayes said， “We immediately became aware of it and had the child sent home. He’s staying at home with his family until 10 days after symptoms disappear.”
The researchers guessed that the virus might have come from animals. However， the scientists have not ruled out the possibility that some other microbe might also help make SARS more serious or easier to catch.
64. The best title for this text is _______.
A. A Worldwide Warning B. Suspected SARS Cases
C. What Is SARS D. Possible Spread of SARS in the USA
65. The writer wrote this text mainly to _______.
A. discuss the danger of SARS
B. report research result about SARS
C. inform people of the spread of SARS
D. explain to the readers what SARS is
66. How many cases of suspected SARS are there in the U.S.A. according to the text?
A. 166. B.178. C. 12. D. 181.
www.170xue.comD
Snow falls in the Earth’s extreme North and South throughout the year. However，the heaviest snowfalls have been reported in the mountains of other areas during winter. Snow is even known to fall near the Equator (赤道)，but only on the highest mountains.
Snow contains much less water than rain， but much of the water the world uses comes from snow. Melting snow provides water for rivers， electric power stations and agricultural crops. In the western United States， mountain snow provides up to seventy-five percent of all surface water supplies.
Snowfall helps to protect plants and some wild animals from winter weather. Fresh snow is made largely of air trapped among the snow crystals (晶体). Because the air has trouble moving， the movement of heat is limited. Snow also influences the movement of sound waves. The surface of the snow takes in， or absorbs， sound waves. As snow grows older or if there have been strong winds， it can become hard and flat. Then， the snow’s surface will help to send back sound waves.
Snow may be beautiful， but it can be deadly. It is responsible for the deaths of hundreds of people. Many people die in traffic accidents on roads covered with snow and ice or from being seriously stuck in the winter storm. Others die from heart attacks caused by too much physical activity out in the cold.
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