[单项选择]According to the passage, "infralimbic neurons … fire to the tone only when rats are recalling extinction on the following day" (lines 7-9) for which of the following reasons
A. Extinction has not been proven to erase the memory of fear conditioning in rats.
B. The extinction response requires a number of days to develop.
C. The subject’s original fear response was not conditioned to a tone.
D. The infralimbic cortices carry the memory of fear extinction.
E. Rats that show the least fear demonstrate the greatest increase in infralimbic tone responses.

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[单项选择]Passage 2

According to the passage, which is NOT tree about chronic diseases a. It is estimated that seventy-five percent of the people will die from chronic diseases after ten years. b. There are more people killed by chronic diseases in China than in the US. c. China will spend more than five hundred thousand yuan on the chronic diseases in the next ten years. d. Russia also suffers from economic losses because of chronic diseases.

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[单项选择]According to the passage, which of the following findings confirms the author’s conclusions concerning disease morbidity rates associated with pollutants
A. Certain organs are more reponsive than others to the hormones created by environmental pollutants.
B. The incidence of breast cancer correlates with the presence of environmental pollutants.
C. A great deal of evidence has been amassed linking environmental pollutants with cancer in animals.
D. Cancer diagnosis has become more reliable than it once was.
E. Cancer of the liver, an organ that is hormonally responsive to environmental pollutants, is rising globally.

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[单项选择]

Passage Three

According to the best historical and archaeological evidence, it is estimated that it took about 800 thousand to 1 million years for the earth's population to reach the 250 total which existed at the end of the first century 'after Christ. For some time after that, disease, famine, and war kept the population increase down to a fraction of 1 percent a year so that more than 15 centuries passed before the population reached 500 million. But in the next 250 years, up to 1850, the population of the world shot up to the 1 billion mark, and today it has reached 3 billion. It is predicted by United Nations investigators that in the next 35 years the population of the world will double.
When experts are asked what the most effective measure which overpopulation poses, they reply that at least three measur
A. estimates based on current population growth
B. references in literature and mythology
C. estimates based on previous population growth
D. written records and cultural remains

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[单项选择]Passage 3

According to the passage, how many universities took part in the study a. Three. b. Four. c. Five. d. Two.

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[单项选择]According to the following passage, which of the following statements is true of international comparisons of overall fat intake
A. They provide a reasonable indicator of the health benefits of polyunsaturated fats.
B. They tend to conflate too many factors to provide an effective argument against reducing overall fat intake.
C. They are rife with subtleties too complex for most nutritionists to be able to understand properly.
D. They correctly tend to indicate the necessity for reducing overall fat intake reduction in affluent societies.
E. They tend to lend too much attention to non-dietary causes of coronary heart disease.

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[单项选择]According to the passage, why haven’t scientists found a cure for the common cold（）
A. They haven’t devoted as much energy to medicine as to space travel.
B. There are too many kinds of cold viruses for them to identify.
C. It is not economical to find a cure for each type of cold.
D. They believe people can recover without treatment.

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[填空题]According the passage, to build paradise needs ______.

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[单项选择]What is true according to the passage
A. She could see and hear again.
B. She became a writer and wrote a lot of books.
C. She painted many drawings.

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