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2010年1月15日，中共中央政治局常委李长春在中央歌剧院调研时强调，要积极推动国家重点扶持的艺术院团深化内部体制机制改革，坚持贴近实际、贴近生活、贴近群众，在面向群众、面向市场的实践中，进一步增强生机活力，多出精品力作、多出优秀人才。这样做 ①有利于弘扬和培育以改革创新为核心的时代精神 ②有利于满足人民群众日益增长的精神文化需求 ③有利于发展为人民大众所喜闻乐见的社会主义文化 ④有利于增强人们思想活动的独立性Research suggests that a newly-identified gene known as insomniacs(失眠症患者) may play a role in keeping us asleep. By cloning and testing this gene in about 21,000 fruit flies, Rockefeller University researchers say they have discovered an entirely new mechanism (机制) by which sleep is controlled. By studying these flies, the researchers discovered that mutations(变异) in the insomniac gene were associated with a great reduction in sleep. While a typical fruit fly slept for an average of 927 minutes a day, the mutant flies slept for just 317. They also slept for shorter periods of time, and slept and woke more frequently. “The results showed a great loss of both the time that the flies’ sleep lasted and their ability to remain asleep after they slept,” says researcher Nicholas Stavropoulos. The researchers also examined the link between sleep and lifespan, finding that flies with mutations to the insomniac gene lived only about two-thirds as long as unchanged flies. But when the scientists removed insomniac only in neurons（神经细胞）---allowing it to remain in the rest of the flies’ bodies---this difference disappeared; the resulting animals slept poorly but lived just as long. “This suggests that reduced sleep can be ‘uncoupled’(分开) from reduced lifespan, supporting the idea that some interruptions of sleep do not affect overall health, at least as far as lifespan is concerned,” Stavropoulos says. Although flies and humans would appear to have little in common when it comes to lifestyle, scientists say that the mechanisms of sleep and wakefulness are likely to be quite similar. “Sleep is a fundamental behavior in all animals, and it is poorly understood from a scientific standpoint, says Stavropoulos. This work could prove useful in understanding and treating sleep disorders” 68. The text is mainly about____.   A. the progress in cloning fruit flies   B. the methods of cloning fruit flies   C. the link between gene and lifespan   D. the influence of a gene on the ability to sleep 69. According to paragraph2, the mutant flies________. A. slept about 5 hours a day B. had problems waking up C. didn’t seem sleepy at all D. could not fall asleep 70. We can conclude from the text that________.   A. sleep and health go hand in hand B. sleep can be controlled by humans C. research into sleep is very fruitful D. the findings are useful in medical treatment