题目
题型：不详难度：来源：
In the last 5,000 years, humans have reduced forest from roughly 50 percent of the earth’s land surface to less than 20 percent. Most of this original, or old growth, forest cover is concentrated in three large areas: the Canadian and Alaskan boreal forest, the boreal forest of Russia, and the tropical forest of the northwestern Amazon Basin and the Guyana Shield. These areas comprise almost 70 percent of the world’s remaining original forest cover. In most places, the rate of deforestation is increasing, with the alarming result of 16 million hectares disappearing worldwide every year.
Loss of forest does not just mean the decline of natural resources. There are several other factors that make deforestation seriously harmful to both the human and natural worlds. One of them is changes in the global climate. For example, forest clearance is releasing substantial volumes of carbon dioxide (CO2) into the atmosphere as vegetation is burnt or decays. It has been suggested that this is a significant factor in global warming. Moreover, about 10 percent of the world’s tree species are in danger of extinction as a result of deforestation. Deforestation also threatens biological diversity through the destruction of wildlife habitats, which endangers a number of animal species and leads to their potential disappearance. Species are particularly easy to extinction in tropical rainforests because many species have few individuals per unit area, which makes reproduction more difficult. Finally, since forests play an important role in storing water and stabilizing soil, deforestation and the resulting change in land use cause soil erosion (腐蚀) and other forms of land degradation.
72. The passage discusses all of the following EXCEPT the ________.
A. causes of deforestation B. consequences of deforestation
C. management of deforestation D. rate of deforestation
73. The word “diversity” in the last paragraph probably means “________”.
A. variety B. expansion
C. development D. advantage
74. Why does the author mention fuel and timber in Paragraph 1?
A. To explain the rate of deforestation.
B. To compare them with housing and ships.
C. To show the dangers of deforestation.
D. To illustrate the causes of deforestation.
75. Which of the following sentences summarizes Paragraph 3 best?
A. Deforestation threatens biological diversity.
B. Deforestation has many harmful consequences.
C. Deforestation causes changes in global climate.
D. Deforestation should be stopped.
答案
解析
核心考点
试题【Whenever human populations have lived in forest areas, they have always cut down】；主要考察你对题材分类等知识点的理解。[详细]
举一反三
As we drove off from Columbia, I wanted to write a letter to you to tell you all that is on my mind.
First, I want to tell you how proud we are. Getting into Columbia is a real proof of what a great well-rounded student you are. You should be as proud of yourself as we are.
It is in college that you will discover what learning is about. This will be the period where you go from teacher-taught to master-inspired, after which you must become self-learner. So do take each subject seriously, and even if what you learn isn’t critical for your life, the learning skills you acquire will be something you will treasure forever.
Follow your passion in college. Take courses you think you will enjoy. Don’t be trapped by what others think or say, but make up your own mind.
Most importantly, make friends and be happy. Pick a few friends and become really close to them – pick the ones who are genuine to you. Don’t worry about their grades, looks, or even personalities.
Start planning early. I think your plan to study fashion is good, and you should decide where you want to be, and get onto the right courses.
Whether it is coursework planning or picking a major, you should take control of your life. I will always be there for you, but the time has come for you to be in the driver’s seat – this is your life, and you need to be in control. Being in control feels great.
So please treasure your college years – make the best of your free time, become an independent thinker in control of your destiny fate, learn and grow through your successes and challenges.
May your years at Columbia be the happiest of your life, and may you blossom into just what you dream to be.
Love,
Dad (& Mom)
65. According to the letter the author’s daughter is ______.
A. scared to be leaving home B. a well-rounded student
C. the pride of her university D. learning to drive a car
66. Which advice below is given to his daughter by the author?
A. Party with friends in her free time.
B. Ignore what others think or say.
C. choose friends with similar personalities.
D. Treasure and make the best of her college years.
67. From the passage, we can conclude the father is ______.
A. worried about his daughter B. strict with his daughter
C. positive about his daughter’s future D. sad about his daughter’s leaving home
Earlier studies have documented half-brain sleep in a wide range of birds. The brain hemispheres take turns sinking into the sleep stage characterized by slow brain waves. The eye controlled by the sleeping hemisphere keeps shut, while the wakeful hemisphere’s eye stays open and alert. Birds also can sleep with both hemispheres resting at once.
Decades of studies of bird groups led researchers to predict extra alertness in the end-of-the-row sleepers which tend to be attacked more easily. Sure enough, the end birds tended to watch carefully on the side away from their companions. Ducks in the inner spots showed no preference for gaze direction.
Also, birds napping at the end of the line depend on single-hemisphere sleep, rather than total relaxation, more often than inner ducks did. Turning 16 birds through the positions in a four-duck row, the researchers found that compared with 12 percent for birds in internal spots, outer birds half-asleep during some 32 percent of napping time.
“We believe this is the first evidence for an animal behaviorally controlling sleep and wakefulness at the same time in different regions of the brain,” the researchers say.
The results provide the best evidence for a long-standing assumption that single-hemisphere sleep evolved as creatures scanned for enemies. The preference for opening an eye on the lookout side could be widespread, he predicts. He’s seen it in a pair of birds napping side-by-side in the zoo and in a single pet bird sleeping by a mirror. The mirror-side eye closed as if the reflection were a companion and the other eye stayed open.
Useful as half-sleeping might be, it’s only been found in birds and such water animals as dolphins, whales, and seals. Perhaps keeping one side of the brain awake allows a sleeping animal to surface occasionally to avoid drowning.
Studies of birds may offer unique insights into sleep. Jerome M. Siegel of the UCLA says he wonders if birds’ half-brain sleep “is just the tip of the iceberg.” He supposes that more examples may turn up when we take a closer look at other species.
72. According to the passage, birds often half sleep because ______.
A. they have to watch out for possible attacks
B. their brain hemispheres take turns to rest
C. the two halves of their brain are differently structured
D. they have to constantly keep an eye on their companions
73. What is implied about the example of a bird’s sleeping in front of a mirror?
A. An imagined companion gives the bird a sense of security.
B. Birds prefer to sleep in pairs for the sake of their security.
C. The phenomenon of birds napping in pairs is widespread.
D. A single pet bird enjoys seeing its own reflection in the mirror.
74. While sleeping, some water animals tend to keep half awake in order to ______.
A. alert themselves to the approaching enemy
B. emerge from water now and then to breathe
C. be sensitive to the ever-changing environment
D. avoid being swept away by rapid currents
75. By saying “just the tip of the iceberg”, Siegel suggests that ______.
A. half-brain sleep has something to do with icy weather
B. the mystery of half-brain sleep is close to being solved
C. most birds living in cold regions tend to be half sleepers
D. half-brain sleep may exist among other species
完形填空（共20题，每小题1分）
阅读下面一段文章，从A 、B、 C、 D 四个选项中选出最佳选项。
Water costs money. In some places water is hard 36 . what 37 when a town has these problems ? A small town in California found a happy 38 .
Very 39 rain ever fell there. The town had no water 40 . The water it used was
41 from a river 300 miles away. As more people 42 live in the town, 43 water was needed. Now water 44 to be brought in from 600 miles ways. All these cost 45 money.
The town 46 a plan. It found 47 to clean its “dirty” water. Once the cleaned water was reused 48 many ways. Five 49 lakes was built. Here people could swim and fish and go 50 . They 51 have picnics in their new parks. Farmers had more water
52 their crops. New factories can be built, now that they have the promise of 53 .
In most places, water is used and thrown 54 . The town that saved 55 water has saved the town!
36. A. supplying B. getting C. to get D. to supply
37. A. happens B. happening C. is happened D. happened
38. A. key B. answer C. answering D. way
39. A. little B. a little C. few D. a few
40. A. of itself B. of its own C. for its own D. for itself
41. A. fetch B. take C. brought in D. guided
42. A. come to B. came to C. coming to D. came for
43. A. many B. plenty of C. more D. many more
44. A. has B. had C. must D. needed
45. A. many B. a few C. a great many D. a lot of
46. A. put B. made C. supply D. noticed
47. A. a way B. ways C. an answer D. a key
48. A. for B. by C. at D. in
49. A. man-making B. man-make C. man-made D. man made
50.A. boating B. to boat C. to boating D. on boating
51. A. must B. could C. needed D. had to
52. A. as B. with C. for D. to
53. A. water enough B. enough water C. crops enough D. enough crops
54. A. off B. of C. away D. out of
55. A. it’s B. its C. one’s D. his
The exciting life of the American aviation (航空)pioneer is dramatized in the movie Amelia, which is due to come out on October 23.
After Earhart paid a pilot $1 to take her up for a short fly in his plane, aviation became her love and career.
As she later explained, “Never do things others can do and will do, if there are things others cannot do or will not do.”
Earhart found herself a flying teacher and started to learn to fly. She took all sorts of jobs to pay for the lessons and to buy a second-hand plane on her 24th birthday.
In 1932, Earhart flew solo across the Atlantic. She became the first woman to make the solo crossing. She also made a flying suit for women and went on to design other clothes for women who led active lives. “Now and then women should do for themselves what men have already done —— occasionally what men have not done ——thereby establishing themselves as persons, and perhaps encouraging other women toward greater independence of thought and action.” she said.
When she was nearly 40, Earhart was ready for a final challenge—to be the first woman to fly around the world. However, in mid-flight, she and her navigator (导航员) disappeared in bad weather.
Earhart will be forever remembered as a brave pioneer for both aviation and for women.
59. According to the passage, which of the following statements is true?
A. A movie about Earhart’s exciting life has come out.
B. Earhart never did things others could and would do.
C. Earhart’s love for aviation came after she flew a plane for a short time.
D. In Earhart"s opinion, women should think and act more independently.
60. The underlined word in paragraph 2 means ____.
A. presented B. adopted C. published D. created
61. From the passage we can know that ____.
A. Earhart showed most interest in adventure trips to the Missouri River during her
childhood
B. Earhart s ambition was to fly across the Atlantic
C. Earhart challenged herself constantly
D. Besides flying, Earhart also designed planes and clothes
62. You can probably find this article in .
A. a booklet B. a newspaper C. a guide book D. an advertisement
According to Wu Zhenyun, a professor from the Psychological Research Institute under the Chinese Academy of Sciences, a person’s willingness to look in the mirror can reflect his or her mentality. When people don’t care too much about their age, they will try to carry themselves with ease and natural poise (姿态). They don’t mind looking in the mirror to see their own faces. Some people even love to look in the mirror from time to time to see whether they keep a good appearance. In this way, mirror becomes their best friend that help them to look confident.
On the other hand, some people are afraid of being old. They don’t want to see the wrinkles on their face and their hair turning grey. So they don’t want to look in the mirror. This actually reflects a negative attitude they hold towards life. In the long term, they might suffer from psychological pressure or some sort of depression, which is actually not a wise act.
“ Everyone can make themselves look charming at every age stage. If one is confident, one will always look beautiful, it shows that they accept themselves.” professor Wu said.
Mirror cannot only give confidence to one. By looking in the mirror, one can even find the traces of some diseases from one’s own face.
67.Why does the mirror become the best friend for some people?
A. Because it brings much confidence to them.
B. Because it makes them more beautiful.
C. Because it tells whether they are clean or not.
D. Because it helps them find their own faults.
68.The fact that some people are afraid of looking in the mirror reflects that______.
A. they suffer from metal disease B. they treat life in a negative way
C. they are too ugly D. they can’t bear the pressure of being old
69. The text tells us that______.
A. if you are willing to look in the mirror you are getting old
B. everyone can become attractive at any age
C. confidence can make a person look beautiful
D. old people will accept the reality when they are old
70. The writer wrote this passage to______.
A. advise people to look in the mirror constantly
B. reflect different attitude towards looking into a mirror
C. introduce a way of finding signs of disease from one’s face
D. analyze why people like and dislike to look in the mirror
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