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2010职称英语考前每日一练[综合类A级-第35期]

2010-02-04 14:18  来源:     我要纠错 打印 收藏   

  完形填空题

Making the Leap

  Jumps play a big role in many styles of dancing. Generally, what makes a jump impressive is its hang time, the amount of time a dancer spends in the air.

  The quest for greater hang time is a battle against gravity, the constant _____(1) pull of Earth, said Laws. To leave the ground at all, a dancer has to use leg muscles to create an upward push that is greater than Earth's downward pull. But the final _____(2) of any jump depends on just one thing: the upward speed of the body just as the dancer leaves the ground.

  Strengthening muscles so they can push harder is one obvious. _____(3) to achieve higher jumps and increase hang time. But ballet dancers also use a simple trick to gain the illusion of staying in the air longer without actually doing so.

  In a huge sideways jump called a grand jeté (小跳), A _____(4) ballet dancer seems to float for an impossible length of time. Of course, a dancer can't really hang in the air. The laws of physics decree that during any jump, a dancer's center of gravity must follow a parabola (抛物线). A parabola is the same _____(5) path a ball takes when you throw it into the air. So how do dancers make it look like they're hanging in the air?

  A dancer _____(6) the illusion of floating in the air by lifting her legs and arms as she approaches the peak of the jump. The _____(7) of her body responds by sinking a bit. If her timing is just right, she'll seem to float sideways, instead of rising and falling. The effect is not only beautiful; it _____(8) makes the jump seem bigger by "stretching out" the peak.

  Of course, what goes up must come down. During a typical grand jeté, a dancer's center of gravity raises 2 feet _____(9) the ground. Pulled by gravity from such a height, the dancer's body falls very fast - roughly 3.4 meters per second - by the time it reaches the floor.

  As it falls, the body carries with it momentum (动量). Momentum is the weight of the body multiplied by its _____(10). The bigger the body is and the faster it falls, the greater its momentum.

  The only way a dancer can stop dropping through the air is by stopping the body's momentum, which requires an _____(11) force - the ground. Landing can _____(12) injuries. The dancer can ease the landing by bending her knees and letting her arms fall, but she also gets help from an unexpected source: the floor. Wooden dance floors are designed to _____(13) like shock absorbers. They can recoil (回缩) as much as an inch under extreme pressure. That little bit of give (弹性) makes a big _____(14). Landing on a wooden floor, the dancer undergoes a slower change in momentum than she would hitting a rigid floor. The give in the floor allows the decrease in momentum to happen more _____(15) - with less force and less chance of injury.

  51 A side B upward C up D downward

  52 A length B height C weight D breadth

  53 A street B road C way D trail

  54 A skillful B beautiful C respectful D meaningful

  55 A long B short C curved D straight

  56 A obeys B flies C copies D creates

  57 A force B movement C pull D rest

  58 A still B also C yet D so

  59 A off B under C along D onto

  60 A temperature B speed C moisture D time

  61 A rising B falling C opposing D responding

  62 A decrease B cure C remove D cause

  63 A act B love C protect D cancel

  64 A sameness B resemblance C difference D nearness

  65 A gradually B strongly C suddenly D incidentally

  【参考答案

  1. D  2. B  3. C  4. A  5. C

  6. D  7. D  8. B  9. A  10. B

  11. C  12. D  13. A  14. C  15. A

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