题目列表(包括答案和解析)
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Force other than damaging winds are also at work inside tornadoes. Sometimes, as the turning, jumping funnel(漏斗) passes over a house, the walls and ceiling burst apart as if a bomb had gone off inside. This explosion(爆炸) is caused by the low air pressure at the center of a tornado.
The pressure at the center of a tornado is usually 13 pounds per square inch. However, inside the house the air pressure is normal, about 15 pounds per square inch. The difference of 2 pounds per square inch between the inside and outside pressure may not seem like much. But suppose a tornado funnel passes over a small building that measures 20 by 10 by 10 feet. On each square inch of the building, there is 2 pounds of pressure from the inside that is not balanced by air pressure outside the building. On the ceiling, that adds up to an unbalanced pressure of 57,600 pounds. The pressure on the four walls adds up to 172,800 pounds.
If windows are open in the building, some of the inside air will rush out through them. This will balance the pressure inside and outside the building. But if the windows are shut tightly, the great inside pressure may cause the building to burst.
Unfortunately, heavy rain happens in thunderstorms that later produce tornadoes. So, people often shut all windows to protect their property. This may cause far worse damage later.
63. Which of the following is the main topic of the passage?
A. Where tornadoes are formed. B. When tornadoes usually occur.
C. How tornadoes can be prevented. D. Why tornadoes cause so much damage.
64. According to the passage, tornadoes can destroy building because the _____.
A. force of a tornado increases the air pressure in a building
B. air pressure at the center of a tornado is over 172,000 pounds
C. weight of a tornado can crush a building’s roof when it passes overhead
D. air pressure inside a tornado is less than the air pressure inside a building
65. According to the passage, the pressure on a building during a tornado can be reduced by _____.
A. closing the windows B. opening the windows
C. using an electric fan D. making the roof and walls stronger
EVENTS
Bicycle tour and race
A bike tour and race will be held on August 26 and 27(Sat. & Sun.). At 5:30am, the riders will leave Tian'anmen Square and ride the first 35 kilometres as a training leg. Then the next 55 kilometre leg, from Yanjiao to Jixian, will be the first competitive part of the tour. The riders and their bikes will then be taken from Jixian to Changli.
The second racing leg of the tour will be from Changli to the seaside of Nandaihe, covering a distance of 20 kilometres. Saturday night includes the stay at Nandaihe and supper. Sunday morning is free for play at the seaside. At noon all the people and their bikes will be taken back to Beijing.
Cost: 200 yuan Telephone: 4675027
Brazilian footballers
The Brazilian Football Club will play Beijing Guo'an Team at the Workers Stadium on August 26. The club has four national team players . Also coming is 1994 US World Cup star Romario. He has promised to play for at least 45 minutes.
Ticket prices: 60, 100, 150 yuan
Time/Date: 4:30 pm, August 26(Sat.) Telephone: 5012372
Rock climbing
The Third National Rock Climbing Competition will be held on August 26-27 at the Huairou Mountain-climbing Training Base. More than 10 teams from Beijing, Wuhan, Dalian, Jilin and other places will take part in it. A Japanese team will give an exhibition climbing. Free for spectators(观众).
Take a long-distance bus from Dongzhimen to Huairou.
Time/Dates: 9-12 am, August 26 and 27
Telephone: 7143177, 7144850, Wang Zhenghua
45. 1.The main purpose of announcing the above events is to give information about __________.
A. visiting teams B. famous players
C. things to do for the weekend D. prices to pay for the sports events
46. 2.If you take part in the bike tour, you will ride for __________.
A. 35 kilometres B. 55 kilometres C. 75 kilometres D. 110 kilometres
47. 3.What is special about the rock climbing competition?
A. A foreign team takes part in it.
B. You can watch it without paying.
C. You don't have to be a sportsman to take part.
D. The bus trip to the place of the competition is free.
48. 4.If you want to find something to do for Saturday afternoon, which telephone number will you call?
A. 4675027 B. 7143177 C. 5012372 D. 7144850
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