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D
The recent, apparently successful, prediction by mathematical models of an appearance of El Nino—the warm ocean How that periodically develops along the Pacific coast of South America has excited researchers.Jacob Bjerknes pointed out years ago how winds might create either abnormally warm or abnormally cold water in the eastern equatorial (赤道附近的) Pacific.Nevertheless, before the creation of the models, no one could explain why conditions should regularly change between appearances of the warm El Nino and the so-called anti-El Nino.The answer, at least if the current model that links the behavior of the ocean to that of the atmosphere is correct, is to be found in the ocean.
It has long been known that during an El Nino, two conditions exist: unusually warm water extends along the eastern Pacific and winds blow from the west into the warmer air rising over the warm water in the east.The contribution of the model is to show that the winds of an El Nino, which raise sea level in the east, send a signal to the west lowering sea level at the same time.According to the model, that signal is created as a negative (负的) Rossby wave, a wave of lower sea level, that moves westward parallel to the equator at 25 to 85 kilometers per day.Taking months to move across the Pacific, Rossby waves march to the western boundary of the Pacific basin, which is modeled as a smootli wall but in reality consists of quite irregular island chains.
When the waves meet the western boundary, they are reflected, and the model predicts that Rossby waves will be broken into many coastal Kelvin waves carrying the same negative sea-level signal.These eventually shoot toward the equator, and then head eastward along the equator drove by the earth at a.speed of about.250 kilometers per day.When enough Kelvin waves of adequate amplitude (振幅) arrive from the western Pacific, their negative sea-level signal overcomes the feedback mechanism, raising the sea level, and they begin to drive the system into the opposite cold mode.This produces a gradual change in winds, one that will eventually send positive sea-level Rossby waves westward, waves that will eventually return as cold cycle—ending positive Kelvin waves beginning another warming cycle.
67.What is the passage mainly about?
A.How Rossby waves are found.
B.Where El Nino is formed.
C.What the models predict.
D.How the models work.
68.Where does El Nino often appear?
A.Along the western coast of the USA .
B.In the Pacific in the south, of the equator.
C.In the Pacific in the north of the equator.
D.Along the southern coast of South America.
69.What is right according to the passage?
A.Rossby waves and Kelvin waves move in opposite directions along the equator.
B.People could explain El Nino before the creation of the mathematical models.
C.Adequate sea-level waves can produce westward positive cold cycle.
D.The speed of Rossby waves is faster than that of Kelvin waves.
70.What does the underlined word "waves" in Paragraph 3 refer to?
A.Kelvin waves.       B.Sea-level signals.   C.Coastal waves.   D.Rossby waves.
 
67.D    68.B    69.A    70.D
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科目:高中英语 来源:不详 题型:阅读理解


第三部分:阅读理解(共20小题,每题2分,满分40分)
阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项,并在答题卡上将该项涂黑。
A
We bet that on cold wintry days, many of you love to stay in your warm home and, every now and then, come out into the kitchen for a snack. Unfortunately, plenty of creepy-crawly critters(爬行生物) like to do the same thing!
Winter is the time when bugs (虫子) invade your house without an invitation. The season can be tough for such creatures. In winter the air is cold, the ground is hard and many trees have no leaves. So bugs do what they have to do to survive.
Monarch butterflies head south to warmer climates. Ants crowd in deep underground colonies and eat food they have been storing all year. Many insects go into a deep sleep called diapause. There’re different kinds of diapause, but all are similar to hibernation, a time when bigger animals become inactive in the cold. Insects go into an inactive period, too, but it often isn’t when the temperature drops.
They rely on more dependable signals in the environment. For example, many insects can tell how much sunlight there’s each day. They use that to tell them when to shut down. Bugs are cold-blooded, meaning that their inside temperature is the same as the outside. They can’t move much when it gets below 40 degrees Fahrenheit. So they search for any warm place.
They’re looking for protection. These guys have been doing this for 300 million years, so they don’t really know they’re coming into your house. The home is a recent event in terms of their evolutionary behavior. They enter through tiny cracks or come in unnoticed on your clothes or shoes. Remember that they may be invading your homes for warmth and food, but they don’t care about humans.
56. What is the purpose of the first paragraph?
A. To point out that humans like to stay at home in winter.
B. To mean that humans and bugs have the same living habits.
C. To mean that bugs will invade the house for their winter.
D. To put forward the idea that bugs are not welcome in winter.
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A. It is the same as the animals’ hibernation.
B. It often appears in warm areas all the year.
C. It is done to keep bugs active in winter.
D. It is a deep sleep similar to hibernation.
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A. The lower local temperatures.           B. The amounts of sunlight.
C. Kinds of environmental signals.         D. The insects’ inside temperature.
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A. attack humans                                 B. look for enough food
C. seek for protection                           D. show their evolutionary results
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科目:高中英语 来源:不详 题型:阅读理解


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科目:高中英语 来源:不详 题型:阅读理解


E
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D
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科目:高中英语 来源:不详 题型:阅读理解


D
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科目:高中英语 来源:不详 题型:阅读理解


D
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科目:高中英语 来源:不详 题型:阅读理解


第三部分阅读理解(共20小题;每小题2分,满分40分)  
A
Forests have always been useful and important to man who make use of them in many ways. Every day trees are serving man everywhere. Trees supply man with fruits and building materials in the form of wood, without trees it would be impossible to build houses, boats, bridges and so on. Furniture such as desks, chairs and beds is made of wood, trees can stop man from terrible heat. They're also useful in preventing good and rich top soil from being washed away during heavy rains.
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56 . According to the passage,__________.
A. a long time ago, man didn't know how to make use of wood
B. trees are not as useful as they were in the past
C. trees were more found in the past than they are today
D. people have always found trees useful
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A. useless soil; of no use for plants
B. soil on the surface of the earth; good for plants
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D. dry soil in the desert areas; bad for plants
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A. very good lands  B. covered by ice   C. very cold      D. dry and useless
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A. the land would become better             B. heavy rains would be very clean
C. the rich soil couldn't be kept              D. there wouldn't any plants
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A. do nothing to keep the balance of nature
B. take his best to keep the balance of nature
C. try his best to keep the balance of nature
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科目:高中英语 来源:不详 题型:阅读理解

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