53. When the hybrid car is cruising, _______.

A. only the gasoline engine provides power　

B. only the electric motor provides power

C. there is no need to provide power

D. both the gasoline engine and the electric motor provide power.

50. According to the passage, the average IQ is______.

A.85　　　 B.125　　　　 C.100　　　　　 D. 95 51. The case of the twins was mentioned in the passage to support the conclusion that 　　　

______.

A. lack of opportunity blocks the growth of the intelligence

B. an individual's intelligence is determined only by his environment

C. individuals with identical brains are seldom tested at the same level

D. changes of environment produce changes in the structure of the brain 52. This passage suggests that an individual's IQ______.

A. can be predicted at birth 　　 B. stays the same throughout his life

C. is determined by his childhood　　 D. can be increased by education

D

Beijing (Dec. 15)--China is going green. In order to reduce air pollution and oil shortages, carmakers have announced their plans to develop hybrid vehicles(混合燃料汽车) for the Chinese market.

The first China made Toyota’s hybrid car Prius hit the road last week. Let’s have a look at the new car.

Any vehicle is a hybrid when it combines two or more sources of power. Hybrid cars use an electric motor with rechargeable batteries(充电电池) and a gasoline engine.

A hybrid car has a smaller than traditional gasoline engine and an electric motor. The gasoline engine provides 99 percent of the power when the car is cruising(匀速行车)。

The electric motor provides extra power for running up hills or when extra acceleration(加速度)is needed.

Step into a Prius, and turn on the power. The first thing you notice is that it is quieter than a traditional car. At this point, the car’s gasoline engine is dormant. The electric motor will provide power until the car reaches about 24km/h. If you stay at low speed, you are effectively driving an electric car, with no gasoline being used, and no exhaust gas given off.

An onboard computer decides when to use the gasoline engine, when to go electric, and when to use a combination of the two. If you go over 24km/h, when you step on the gas pedal(油门), you are telling the computer how fast you want to go.

The electric motor recharges automatically when braking. And when driving at certain speeds, the gasoline engine not only powers the car but also recharges the batteries.

When you use the brake, the electric motor acts like a generator( 发电机) to produce electricity to recharge the batteries. Batteries will last for around 200,000 miles.

48. In Para.3, the author listed _____ explanations for the question why Americans eat their salad before the main course. A. 3 　　 B. 4　　 　　 C. 5　　 　　 D. 6

C

Intelligence and Environment

There are two factors which determine an individual's intelligence. The first is the sort of brain he is born with. Human brains differ considerably, some being more capable than others. But no matter how good a brain he has to begin with, an individual will have a low level of intelligence unless he has opportunities to learn. So the second factor is what happens to the individual-the sort of environment in which he is reared. If an individual is handicapped environmentally, it is likely that his brain will fail to develop and he will never attain the level of intelligence of which he is capable.

The importance of environment in determining an individual's intelligence can be demonstrated by the case of the history of the identical twins. When they are three months old, their parents died, and they were placed in separate foster homes. Peter was reared by parents of low intelligence in a separate community with poor educational opportunities. Mark was reared in the home of well-to-do parents who had been to college. He was read to as a child, stimulated intellectually. This environmental difference continues until the twins were in their late teens, when they were given tests to measure their intelligence. Mark's IQ was 125, twenty-five points higher than the average and fully forty points higher than his identical brother. Given equal opportunities, the twins, having identical brains, would have tested at roughly the same level. 49. This passage is mainly about______.

A. measuring your intelligence

B. what determines an individual's intelligence

C. how brains influence the intelligence

D. the difference between Peter and Mark

47. Which of the following statements is true?

A. Salad first appeared in America, and then was introduced to Europe.

B. Eating salad before the main course was for the sake of health.

C. In less than fifty years, salad became popular throughout the U.S.

D. Serving salad before the main course by the restaurants is a way of cheating

46. In the last sentence of the passage, "rabbit food" refers to______.

A. the salad 　　　　 B. food made of rabbit meat

C. the main course　 　　 D. food prepared for the rabbit

45. The sentence "...Americans preferred to get their greens indirectly, after they had been served with rabbit or deer" means ______.

A. Americans preferred to eat vegetables cooked with rabbit or deer

B. Americans liked both vegetables and meat

C. Americans preferred to eat vegetables served with meat

D. Americans preferred vegetables to meat

44. Before the middle of the nineteenth century______.

A. Americans ate the salad before the main course

B. Americans ate the salad after the main course

C. Americans ate the salad either before or after the main course

D. Americans didn't eat the salad at all

43. What is the purpose of these texts?

　　 A. To provide information of living in New York.

　　 B. To provide directions of city traffic in New York.

　　 C. To give visitors a guide to New York.

　　 D. To give a brief introduction to the history of New York.

B

When dinning in restaurants, Americans usually order drinks first, then soup, salad and main course. This is somewhat a different order way from that in Europe.

Until about the middle of the nineteenth century, Americans didn't have to worry about whether the salad came before or after the main course since they didn't eat salad at all. Champing(嚼) on greens was once considered womanish, and Americans preferred to get the greens indirectly, after they had been served with rabbit or deer. The change of public taste toward the salad may be attributed to New York's Delmonico brothers, who originally introduced smorgasbord from Europe, and served it in their restaurant. Such an unfamiliar thing became so popular that by the end of the nineteenth century, their Waldorf salad had swept the country.

Europeans still champ on greens after the main course, as a way of the sense of taste, and being ready for the cheese. Why Americans eat their salad first is uncertain. The following joking suggestions might make sense: "salad first" may fill you up without any worry about fattening; to avoid customers' impatience with waiting, as the restaurant serves salad first to keep them busy while the main course are being prepared; eating uncooked food while one is waiting for the cooked food may be a way of announcing that one is not wasting time, which is seen as a kind of goodness; or probably unfair to the restaurant, this custom has been encouraged by the merchant as a trick-it will be less noticeable if the meal is not rich enough as it comes after "free" salad-after all, rabbit food is much cheaper than the rabbit.

42. If a visitor is interested in music, he will probably go to_______.

　 　 A. Central Park　　　　　　　　 　B. Empire State Building

　 　 C. Intrepid Sea-Air-Space Museum　 D. Madison Square Garden

41. The New York Skyride is for _______.

　　 A. sightseeing　 　　　 　B. fight training　

　　 C. model plane-sports　 　D. city transportation