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Do you want to live another 100 years or more? Some experts say that scientific advances will one day enable humans to last tens of years beyond what is now seen as the natural limit of the human life span.
   "I think we are knocking at the door of live longer,' said Michael Zey, a Montclair State University business professor and author of two books on the future. "I think by 2075 we will            and that's a conservative estimate (保守的估计)."

At the conference in San Francisco, Donald Louria, a professor at New Jersey Medical School in Newark said advances in using genes as well as nanotechnology (纳米技术) make it likely that humans will live in the future beyond what has been possible in the past. "There is a great push so that people can live from I20 to 180 years," he said.
   However, many scientists who specialize in ageing are doubtful about it and say the human body is just not designed to live past about 120 years. Even with healthier lifestyles and less disease, they say failure of the brain and organs will finally lead all humans to death.
   Scientists also differ on what kind of life the super aged might live. "It remains to be seen if you pass 120, you know; could you be healthy enough to have good quality of life?" said Leonard Poon, director of the University of Georgia Gerontology Centre. "At present people who could get to that point are not in good health at all."

76.What is the main idea of the passage?(no more than 10 words)

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77.Please fill in the blanks in the second paragraph with proper words or phrases to complete the sentence(no more than 10 words)

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78.What did Leonard Poon worry about? (no more than 15 words)

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79.What does the word “it”(Line1,Paragraph4)probably refer to? (no more than 8 words)

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80.According to Donald Louris, what will enable humans to live longer?(no more than 7 words)

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    Drive through any American city or suburb, and you will see large space where huge stores are grouped together, sometimes even under one roof. The sight of such huge stores would have been unusual for our grandparents, who shopped in small neighborhood stores. There shopping areas reflect some major changes in American society.

    The construction of new supermarkets and shopping centers has been continuing over the past forty years. Supermarkets continue to appear because they offer the shopper a wide choice of products in one place—anything from food to small appliances. Because of the large amount of goods sold , supermarkets can offer lower prices than small neighborhood stores can. The convenience and value of large stores and shopping areas have them an important part of the way of American shopping.

    With the rise of supermarkets and shopping centers, American society has experienced some changes. Most obviously, many small neighborhood stores have disappeared, driven out of business by the large stores. Now Americans use cars even more in order to get to and carry products from the shopping centers, which are typically located farther from many homes. Another change is perhaps the least easy to describe. Americans are now more isolated. In the neighborhood store, the owner knew about the customers and their families. People in the neighborhood could gather and talk there. Now Americans shop in huge spaces, where no one knows anyone else. Supermarkets have made shopping more personal.

   It is clear that the number of supermarkets and large shopping areas is still increasing. The pattern of “bigger is better” will probably continue into the future.

71. A major change in American society listed in the passage is _____.

A. the development in the neighborhood             B. the place for shopping

C. the development in the suburbs                     D. the relationship between shop owners and customers

72. Compared with small neighborhood stores, supermarkets_____.

A. are located everywhere                                 B. are built far away from each other

C. sell various goods at lower prices                  D. have limited space for further development

73. Now Americans do shopping      .

A. in typical neighborhood stores                       B. in faraway supermarkets or shopping centers

C. in stores where they can chat with the owners       D. in stores within walking distances

74. The underlined sentence in paragraph three means _____.

A. shoppers in supermarkets usually don’t know each other             

B. supermarkets are a good place for shopping

C. supermarkets are controlled by machines                            

D. shoppers will easily get lost in supermarkets

75. The author believes _____.

A. people will try to be friendly while shopping supermarkets

B. supermarkets and large shopping centers will continues to exist in the future

C. supermarkets will probably no longer exist in the future

D. neighborhood stores are equal to supermarkets in convenience

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