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1.
下列诗句，词句中“君”为作者自指的是 （ ）
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2.
（二）American society is not nap (午睡) friendly. In fact, says David Dinges, a sleep specialist at the University of Pennsylvania School of Medicine. "There's even a prohibition against admitting we need sleep". Nobody wants to be caught napping or found asleep at work. To quote a proverb: "Some sleep five hours, nature requires seven, laziness nine and wickedness eleven. " Wrong. The way not to fall asleep at work is to take naps when you need them. " We have to totally change our attitude toward napping", says Dr. William Dement of Stanford Univereity, the godfather of sleep research. ? Last year a national commission led by Dement identified an "American sleep debt" which one member said was as important as the national debt, The s concerned about the dangers of sleepiness: people causing industrial accidents or falling asleep while driving. This may be why we have a new sleep policy in the White House. According to recent reports, president Clinton is trying to take a half瞙our snooze (打瞌睡) every afternoon. ? About 60 percent of American adults nap when given the opportunity. We seem to have "a midafternoon quiet phase"also called"a secondary sleep gate. "Sleeping 15 minutes to two hours in the early afternoon can reduce stress and make us refreshed. Clearly, we were born to nap. ? We Superstars of Snooze don't nap to replace lost shut ye or to prepare for a night shift. Rather, we"snack"on sleep, whenever, wherever and at whatever time we feel like it. I myself have napped in buses, cars, planes and on boats; on floors and beds; and in libraries, offices and museums. 6. It is commonly accepted in American society that too much sleep is ______ . A. unreasonable B. criminal C. harniful D. costly
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3.
25℃，pH=2的硫酸溶液中，由水电离出的H +浓度为（??）
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4.
神经系统的基本活动方式是( )
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5.
The following are the factors that have contributed to the development of the U.S. economy EXCEPT _____. A. the vast space resources of the land B. the ideals of freedom economic opportunityC. English as its national languageD. hard work by the people
