题目内容
The key _____ success is to choose a right goal, plan your path and then get started.
A. about B. of C. to D. with
C
Which animal has the fastest snapping jaw (颚)? If you're guessing a shark or perhaps a larger animal, you'll have to think smaller. The trapjaw ant, which lives in Central and South America, moves its mouth parts at 35 to 63 meters per second. Another way to think about this is that the ant's jaws close at 125 to 233 kilometers per hour. That's 2, 300 times faster than the blink of an eye.
Scientists were able to measure the amazing jaw speed using highspeed video techniques. Sheila Patek, a biologist, says the key is that the jaws have a springy (有弹性的) system, which is critical in getting explosive (爆发性的) speeds.
Consider a bow and arrow. If you try to throw an arrow with your arm, it won't go very far. If you use a bow, elastic energy stored in the bow is released almost instantly when you release the arrow with your finger or a latch. The combination of the springy bow and latch mechanism is what makes the arrow zoom through the air.
Maybe even more amazing than how fast these ants grab food or even enemies is how they use this same energy to move. As the ant closes its jaws, it uses them to push off the ground—all faster than the eye can see without slow motion video. A snap of the jaw can send an ant up to 8.3 centimeters into the air. That's like someone who is 1.7 meters jumping 13 meters high! Not only can they quickly escape from enemies, but often a group of ants will start jumping all at once. It would be hard for their enemies to grab just one.
People have suspected the ants used their jaws to jump for over a century, but could only prove it with today's modern video equipment.
1.The fast speed of the trapjaw ant's jaw lies in ________.
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A．its light body |
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B．its springy system |
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C．its living environment |
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D．the length of its jaw |
2.The passage uses “a bow and arrow” as an example to show ________.
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A．how an arrow gets so much energy to fly |
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B．why the trapjaw ants have springy system |
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C．why the trapjaw ants jaws move so fast |
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D．how a bow and arrow works |
3.Which of the following may amaze the scientists most?
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A．How high the ants can leap by using their jaws. |
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B．How quickly the trapjaw ants can move on the ground. |
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C．How wonderfully the springy system in the trapjaw ants' jaws works. |
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D．How quickly the trapjaw ants can grab food or enemies. |
4.According to the passage, the trapjaw ants' jaws keep them safe because ________.
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A．they can catch their enemies easily with their jaws |
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B．their jaws make them difficult to recognize |
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C．their jaws help them find food easily |
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D．their jaws help them escape from their enemies |
Imagine, one day, getting out of bed in Beijing and being at your office in Shanghai in only a couple of hours, and then, after a full day of work, going back home to Beijing and having dinner there.
Sounds unusual, doesn't it? But it's not that unrealistic, with the development of China’s high—speed railway system. And that’s not all. China has an even greater high-speed railway plan—to connect the country with Southeast Asia, and eventually Eastern Europe.
China is negotiating to extend its own high·-speed railway network to up to 17 countries in 10 to 15 years, eventually reaching London and Singapore.
China has proposed three such projects. The first would possibly connect Kunming with Singapore via Vietnam and Malaysia. Another could start in Urumqi and go through Kazakhstan and Uzbekistan, and possibly to Germany. The third would start in the northeast and go north through Russia and then into Western Europe.
If China’s plan for the high-speed railway goes forward, people could zip over from London to Berlin in under two days.
The new system would still follow China’s high-speed railway standard. And the trains would be able to go 346 kilometers an hour, almost as fast as some airplanes.
China’s bullet train(高速客车),the one connecting Wuhan to Guangzhou, already has the World’s fastest average speed. It covers 1,069 kilometers in about three hours.
Of course, there are some technical challenges to overcome. There are so many issues that need to be settled, such as safety, rail gauge(轨距),maintenance of railway tracks. So, it’s important to pay attention to every detail.
But the key issue is really money. China is already spending hundreds of billions of yuan on domestic railway expansion.
China prefers that the other countries pay in natural resources rather than with capital investment. Resources from those countries could stream into China to sustain development.
It’ll be a win-win project. For other countries, the railway network will definitely create more opportunities for business, tourism and so on, not to mention the better communication among those countries.
For China, such a project would not only connect it with the rest of Asia and bring some much-needed resources, but would also help develop China’s far west. We foresee that in the coming decades, millions of people will migrate to the western regions, where the land is empty and resources unused. With high-speed trains, people will set up factories and business centers in the west once and for all. And they’11 trade with Central Asian and Eastern European countries.
1.China’s new high-speed railway plan will be a win-win project because .
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A．China will get much-needed resources and develop its western regions |
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B．China and the countries involved will benefit from the project in various ways |
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C．China will develop its railway system and communication with other countries |
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D．the foreign countries involved will develop their railway transportation, business and tourism |
2.According to the passage, the greatest challenge to the new high-speed railway plan is .
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A．technical issues |
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B．safety of the system |
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C．financial problems |
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D．maintenance of railway tracks |
3.Which of the following words best describes the author’s attitude towards China’s high-speed railway plan?
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A．Critical. |
B．Reserved. |
C．Doubtful |
D．Positive. |
4.Which of the following might be the best title for the passage?
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A．New Railway Standards |
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B．Big Railway Dreams |
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C．High-speed Bullet Trains |
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D．International Railway Network |