题目内容
D
Since the gene, called DAF-16 in worms, was found in many animals and in humans, the finding could open up new ways to affect aging, immunity(免疫)and resistance in humans, the scientists said.?
“We wanted to find out how normal aging is being governed by genes and what effect these genes have on other traits, such as immunity,” said Robin May of the University of Birmingham, who led the study.?
Populations across the world are aging at a surprising pace, bringing potentially big challenges for health and social care systems. A study by Danish scientists last year found that half of babies born in the rich world today will live to celebrate their 100th birthdays. Scientists are eager to find out how people age to try to develop drugs to help them stay healthier as their lives extend.?
“What we have found is that things like resistance and aging tend to go hand in hand,” May said in an interview.?
May’s team compared longevity, stress resistance and immunity in four related species of worm. They also looked for differences in the activity of DAF-16 in each of the four species, and found that they were all quite distinct.?
May said DAF-16 was active in most cells in the body and was very similar to a group of human genes called FOXO genes, which scientists believe play a role in the aging process.?
“The fact that subtle(微妙的)differences in DAF-16 between species seem to have such an impact on aging and health is very interesting and may explain how differences in lifespan and related traits have arisen during evolution,” May said.?
71. In which section may the text appear in a newspaper? ?
A. Education. B. Science. C. Entertainment. D. Culture.
72. According to May_________,.?
A. resistance has a lot to do with aging?
B. FOXO genes can be found in worms?
C. genes play the same role in different species?
D. new drugs will change the genes in older people
73. What can we know from the third paragraph??
A. New ways have been found to affect aging. ?
B. Babies in the rich world will all live longer. ?
C. Present social care systems are poorly managed.?
D. Aging populations are causing more challenges.
74. From the text we know that DAF-16.?
A. is a gene that is only found in worms? B. can make people live longer?
C. has an effect on aging and immunity? D. has been quite familiar to scientists
75. What can be the best title of the passage?
A. Scientists Find Gene Linked to Aging B. Population Aging Faster than Expected
C. How to Make People Live Longer D. Gene Determines How Long We Live
71—75 BADCA?
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It is "one of the few bright spots in the Chinese economy," says Zeng Ming. He is talking about e-commerce. Mr Zeng, the chief strategy officer for Alibaba, a giant Chinese Internet firm, predicts that digital transactions on his firm's platforms will top l trillion yuan ($159 billion) this year-more than Amazon's and eBay's combined. That is a bold claim, but consider what happened on Singles Sunday.
Invented a few years ago by students and seized upon by digital marketers, this festival for lonely hearts falls annually on the llth day of the llth month (since l is the loneliest number).It is like St Valentine's Day, only worse. Singletons shower each other with tender gifts: a barrage of pearls; a storm of sweets.
This November llth they spent a surprising 19 billion yuan on Alibaba's online platforms-a fourfold increase on a year ago, and more than double what Americans spent online last Cyber Monday (the Monday after Thanksgiving, when retailers urge Americans to shop online). About 100m purchases were logged, accounting for 80% of the packages shipped that day. Couriers(怏递员) were buried in parcels.
So life is good for China's e-tailers, then? Not exactly. The number of digital marketers is increasing and online sales are booming. Consumers are enjoying lower prices, better service and more variety. The problem? The pressure on profits in Chinese e-commerce is worse than in America, reckons Elinor Leung of CLSA, a broker. "Almost no one makes money," she says.
The fiercest battles are being fought between online retailers and their bricks-and-mortar(实体的) rivals.Dangdang, a firm. that resembles Amazon,.and 360buy, another online retailer, have cut prices fiercely. Tencent, a cash-rich online giant known for its instant-messaging software, is splashing out to win market share. 360buy has also just raised $400m from investors to do the same. But it is unclear how much longer such firms can burn through capital.
【小题1】What's the best title of this passage?
A.The Ambition of Alibaba |
B.Fierce Competition between Retailers |
C.A Newly Sprung Festival for the Singles |
D.Chinese Booming and Developing E-commerce |
A.outweigh Amazon and eBay in worldwide influence |
B.rank top among all the Internet firms |
C.have more than 159 billion dollars' sale |
D.create another sales miracle just like the one on Singles Day |
A.About 80 million. | B.About 100 million. |
C.About 125 million. | D.About 180 million. |
A.Optimistic. | B.Concerned. |
C.Sympathetic. | D.Indifferent. |