2015年职称英语考试卫生类B级模拟试题及答案(第

　　The idea has reigned for years that the aging brain's neurons die off by as many as 1 00,000 a day -- taking with their life's cherished memories. But, in fact, neurobiologist such as Alan Peters of Boston University have shown in recent studies that, while brain cells may shrink in old age, they don't die off in large numbers. What's more, say neuroscientists it's primarilj the brain's "hardware" -- the billions of telephone-line-like connections and relay switches which act as processing equipment-that is vulnerable to wearing out with age. The brain's "software"-the actual information that fills up the mind over a lifetime-doesn't necessarily deteriorate. If anything, it can grow more sophisticated. So, just as running the latest software program on an old computer will take more time and may involve some glitches, one can still possess a first-rate intelligence while losing some cognitive speed later in life.

　　When mental abilities do pass their peak, memory isn't the first to go, Powell and others say. It's usually the brain's capacity to make sense of spatial relationships-map-reading or finding your car at the mall-which may begin to get difficult in your 40s. A decade later, the abstract reasoning required to make analogies dips downward.Next to drop is "verbal memory after delay" --remembering details of a story after having turned attention to other tasks. But some mental skills, such as the ability to concentrate or calculate math, seem to remain sturdy long into old age. And "procedural" memory-how to play golf or ride a bike-is usually not touched by aging.Even "common" memory loss, however, shouldn't be considered normal. It could be treatable. Neurologists at Harvard are finding that, later in life, the brain often produces less acetylcholine, a neurotransmitter involved in memory. Tentative results suggest that drugs could mimic the missing chemical. At least a dozen other substances (estrogen, for example) are also being studied as potential memory boosters.

　　66. According to the neuroscientists, the information in our mind__________.

　　A. is easy to be lost at old ages.

　　B. does not change at old ages.

　　C. wears out easily with age.

　　D. can be more complicated at old ages.

　　67. The neuroscientists compare our brain with computer to show that__________.

　　A. when people get old , their brains work slowly as old machines

　　B. human beings are as intelligent as computers.

　　C. the structure of our brains is very complicated.

　　D. a great deal of information can be stored in our brains.

　　68. According to the passage, at what age do our brains work bost?

　　A. When we are younger than thirty.

　　B. When we are about forty.

　　C. When we are over fifty.

　　D. Our brains will work well until we are very old.

　　69. What might happen when we are in our 50s?

　　A. We begin to forget whero we have put our things.

　　B. We begin to have difficulty in explain the state in which two things are alike in many Ways .

　　C. We begin to forget the massage that we have been told.

　　D. We begin to forget how to operate a machine.

　　70. Which of the following is the best title of this passage?

　　A. How to Keep Our Memories at Old Ages

　　B. Memories Goes First When We Are Old

　　C. Exploding the Myth of Our Memory

　　D. How to Stay Mentally Alert

　　答案：

　　1. B 2. C 3. D 4. B 5. D 6. A 7. B 8. D 9. C 10.B

　　11.A 12.A 13.B 14.A 15.C 16.D 17.A 18.D 19.D 20.D .

　　21.B 22.B 23.D 24.A 25.A 26.B 27.A 28.B 29.B 30.C

　　31.D 32.A 33.D 34.B 35.C 36.A 37.A 38.A 39.B 40.A

　　41.C 42.D 43.B 44.A 45.C 46.B 47.D 48.D 49.B 50.C

　　5l.B 52.C 53.D 54.A 55.A 56.C 57.A 58.B 59.D 60.D

　　61.A 62.C 63.C 64.A 65.C 66.D 67.A 68.B 69.C 70.C

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