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听力原文: 25 years ago, Ray Anderson, a single parent with a one-year-old son witnessed a terrible accident which took place when the driver of a truck ran a red light and collided with the car of Sandra D. The impact of the collision killed Sandra instantly. But her three-month-old daughter was left trapped in the burning car.
While others looked on in horror, Andersen jumped out of his vehicle and crawled into the car through the shadowed rear window to try to free the infant. Seconds later, the car was enclosed in flames. But to everyone's amazement, Andersen was able to pull the baby to safety. While the baby was all right, Andersen was seriously injured. Two days later he died. But his heroic act was published widely in the media.
His son was soon adopted by relatives. The most remarkable part of the story unfolded only last week. Karen and her boyfriend Michael were looking through some old boxes when they came across some old newspaper clippings. "This is me when I was a new born baby. I was rescued from a burning car. But my mother died in the accident," explained Karen.
Although Michael knew Karen's mother had died years earlier, he never fully understood the circumstances until he skimmed over the newspaper article. To Karen's surprise, Michael was absorbed in the details of the accident. And he began to cry uncontrollably. Then he revealed that the man that pulled Karen from the flames was the father he never knew. The two embraced and shed many tears, recounting stories told to them about their parents.
(30)

A. Michael's parents got divorced.
B. Karen was adopted by Ray Anderson.
C. Karen's mother died in a car accident.
D. A truck driver lost his life in a collision.

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The Effects of Global Warming on Weather
There are hidden factors which scientists call “feedback mechanisms”. No one knows quite how they will interact with the changing climate. Here’s one example: plants and animals adapt to climate change over centuries. At the current estimate of half a degree centigrade of warming per decade, vegetation (植物) may not keep up. Climatologist James Hansen predicts climate zones will shift toward the poles by 50 to 75 kilometres a year—faster than trees can naturally migrate. Species that find themselves in an unfamiliar environment will die. The 1000-kilometer-wide strip of forest running through Canada, the USSR and Scandinavia could be cut by half. Millions of dying trees would soon lead to massive forest fires, releasing tons of CO2 and further boosting global warming.
There are dozens of other possible “feedback mechanism”. Higher temperatures will fuel condensation and increase cloudiness, which may actually damp down global warming. Others, like the “albedo” effect, will do the opposite. The “albedo” effect is the amount of solar energy reflected by the earth’s surface. As northern ice and snow melts and the darker sea and land pokes (戳) through, more heat will be absorbed, adding to the global temperature increase.
Even if we were to magically stop all greenhouse-gas emissions tomorrow the impact on global climate would continue for decades. Delay will simply make the problem worse. The fact is that some of us are doing quite well the way things are. In developed world prosperity has been built on 150 years of cheap fossil fuels.
Material progress has been linked to energy consumption. Today 75 percent of all the world’s energy is consumed by a quarter of the world’s population. The average rich-world resident adds about 3.2 tons of CO2 yearly to the atmosphere, more than four times the level added by each Third World citizen. The US, with just seven per cent of the global population, is responsible for 22 per cent of global warming.
“Feedback mechanisms” in paragraph 1 most probably refer to______.

A. how plants and animals adapt to hidden factors
B. how plants and animals interact with the changing climate
C. how climate changes
D. how climate zones shift

What does the sentence "... meals in Gir are not necessarily frantic affair" (Parit. 3) mean?

A. The lions do not show intimacy among them any more.
B. The lions may not need to fight for food.
C. Food is not readily available in that region.
D. Meals can be obtained only with great effort.

Japanese firms are competing in the production of robots specifically ______.

A. used in car factories
B. used in hospitals
C. helping the old people
D. helping the school kids

已知普通混凝土的试配强度为38.2MPa,水泥实际抗压强度为48MPa。粗骨料为碎石 (A=O.46,B=0.07),则其水灰比应为()。

A. 0.44
B. O.56
C. 1.8
D. 0.58

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