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The Aerospace Bicycle That Fell to Earth
A radical new bicycle had its first public showing at the National British Cycling Championships in Shrewsbury last weekend. Based on the gold medal-winning design from the Barcelona Olympics, it is the first commercial mountain bike made of a single piece of carbon fibre.
Bicycles for amateurs have up to now been made of steel, aluminum or magnesium tubes welded together into the conventional "A-frame"shape. But last year, the British competitor Chris Boardman set world records while winning titles in the Olympic cycling pursuit events on a custom built, carbon-fibre bicycle with lower weight and wind resistance than standard models. Because carbon fibre is both light and extremely strong, it does not need the A-frame shape, saving further weight. Carbon fibre can also be moulded in a single piece, avoiding the weakness of welds.
The new bike, which will cost between $ 2000 and $ 3000 wh
A. that people buy only for riding in their daily life
B. that are bought by amateur cyclists who like cycling as an exercise
C. that are built for customers in general
D. that non-Olympic competitors use
[填空题]Bicycle sales fell in 1999 but rose again in 2000 to be at the same leval as in 1998.
[单项选择]Some people would rather ride bicycle as bicycle riding has（）of the trouble of taking buses.
A. nothing
B. none
C. some
D. neither
[单项选择]A. The bicycle is being repaired. B. The bicycle is new.
C. She lent the bicycle to a friend. D. The bicycle is parked outside.
[单项选择]A. Alison fell in love with Jim. B. Jim fell in love with Alison.
C. Jim wasted a lot of time. D. Jim wasted a lot of energy.
[单项选择]EVENTS
Bicycle tour and raceThe 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
A. Brazilian footballers
B. TheBrazilian Football Club will play Beijing Guoan Team at the Workers Stadium on July 26. The club has several national team players. Also coming is 1994 US World Cup star Romario who has promised to play for at least 45 minutes.
C. Ticketprices: 60 yuan, 100 yuan, 150 yuan
D. Time/Date:4:30 p. m. , July 26 ( Sat. )
E. Telephone:5012372
F. Rock climbing
G. TheThird National Rock Climbing Competition will be held on July 26～27 at the Huairou Mountain climbing Training Base. More than 10 teams from Beijing, Wuhan, Daiian, Jilin and other places will take part in it. A Japanese team will give an exhibition of climbing. Free for spectators (观众).
H. Takea long-distance bus from Dongzhimen to Huairou.
I. Time/Dates:9～12a. m. , July 26 and 27
J. Telephone:7143177, 7144850, Wang Zhenghua
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Escaping from the Earth
The Earth has a force that pulls things toward itself. We call this force gravity(地心引力). This is something we live with all the time, and we take it for granted and hardly ever think about it. But it is a most important factor in rocket operation and must be overcome if we are to get anywhere in space, or off the ground at all.
Take the throwing of a hall as an example. The harder the ball is thrown, the faster and higher it will go. What is the secret Its speed. If we could throw the ball hard enough it would go up and up forever and never come down. The speed at which it would have to be thrown to do this is known as escape speed. Of course, we cannot throw a ball hard enough because the speed required to escape completely from the Earth’s gravity is seven miles per second, or over twenty-five thousand miles per hour.
Once escape speed has been reached by a spacecraft(宇宙飞船), no further power is needed. A rocket aimed
A. Seventy miles per second.
B. Seven thousand miles per hour.
C. Twenty-five thousand miles per second.
D. Twenty-five thousand miles per hour.
