题目内容
（请给出正确答案）
What does the author say about low marriage rates？
A.It lowers divorce rates to some extent.
B.It results in greater tendency of single mothers.
C.It is mainly due to the issue of raising children.
D.It provokes economic and social concerns.
简答题官方参考答案
（由简答题聘请的专业题库老师提供的解答）
更多“What does the author say about low marriage rates？A.It lowers divorce rates to some exte”相关的问题
A.Because it is opening new branches.
B.Because it is short of workers.
C.Because it dismissed some inexperienced workers.
D.Because it is running new businesses.
根据材料，回答下列各题： Why Teenagers Really Do Need an Extra Hour in Bed？ A) "Making teens start school in the morning is cruel ," brain doctor claims. So declared a British newspaper headline in 2007 after a talk I gave at an academic conference. One disbelieving reader responded: " This man sounds brain-dead. " B) That was a typical reaction to work I was reporting at the time on teenage sleep patterns and their effect on performance at school. Six years on there is growing acceptance that the structure of the academic day needs to take account of adolescent sleep patterns. The latest school to adopt a later start time is the UCL Academy in London; others are considering following suit. C) So what are the facts about teenage sleep, and how should society adjust to these needs？ The biology of human sleep timing, like that of other mammals, changes as we age. This has been shown in many studies. As adolescence begins, bedtimes and waking times get later. This trend continues until 19.5 years in women and 21 in men. Then it reverses. At 55 we wake at about the time we woke prior to adolescence. On average this is two hours earlier than adolescents. This means that for a teenager, a 7 a.m. alarm call is the equivalent of a 5 a.m. start for a person in their 50s. D) Precisely why this is so is unclear but the shifts related with changes in hormones (荷尔蒙) at adolescence and the decline in those hormones as we age. However, biology is only part of the problem. Additional factors include a more relaxed attitude to bedtimes by parents, a general disregard for the importance of sleep, and access to TVs, DVDs, PCs, gaming devices, cell phones and so on, all of which promote alertness and eat into time available for sleep. E) The amoount of sleep teenagers get varies between countries, geographic region and social class, but all studies show they are going to bed later and not getting as much sleep as they need because of early school starts. F) Mary Carskadon at Brown University in Providence. Rhode Island, who is a pioneer in the area of adolescent sleep, has shown that teenagers need about 9 hours a night to maintain full alertness and academic perforruance. My own recent observations at a UK school in Liverpool suggested many were getting just 5 hours on a school night. Unsurprisingly. teachers reported students dozing in class. G) Evidence that sleep is important is overwhelming. Elegant research has demonstrated its critical role in memory improvement and our ability to generate wise sohitions to complex problems. Sleep disruption may increase the level of the stress. Excited behaviors, lack of empathy, sense of humor and mood are similarly affected. All in all, a tired adolescent is a moody, insensitive, angry and stressed one. Perhaps less obviously, sleep loss is associated with metabolic (新陈代谢的) changes. Long-term lack of sleep might be an important factor for negative conditions such as diabetes (糖尿病), overweight and high blood pressure. H) Adolescents are increasingly using stimulants to compensate for sleep loss, and caf, feinated (含咖啡咽的) and/or sugary drinks are the usual choice. So a caffeinated drink late in the day delays sleep at night. Tiredness also increases the likelihood of taking up smoking. I) In the US, the observation that teenagers have biologically delayed sleep patterns compared to adults prompted several schools to put back the start of the school day. An analysis of the impact by Kyla Wahlstrom at the University of Minnesota found that academic performance was enhanced, as was attendance. Sleeping in class declined, as did self-reported depression. In the UK, Monkseaton High School near Newcastle instituted a 10 am start in 2009 and saw a progress in academic perfomance. J) However, a later start by itself is not enough. Society in general, and teenagers in particular, must start to take sleep seriously. Sleep is not a luxury but a ftmdamental biological need, enhancing creativity, productivity, mood and the ability to interact with others. K) ff you are dependent upon an alarm clock, or parent, to get you out of bed ; if you take a long time to wake up; if you feel sleepy and impatient during the day; ff your behavior. is overly impulsive, it means you are probably not getting enough sleep. Take control. Ensure the bedroom is a place that promotes sleep-dark and not too warm-dont text, use a computer or watch TV for at least half an hour before trying to sleep avoid avoid bright lights. Try not to nap during the day, and seek out natural light in the morning to adjust the body clock and sleep patterns to an earlier time. Avoid caffeinated drinks after lunch. L) It is my strongly held View, based upon the evidence, that the efforts of dedicated (专注的，投入的) teachers and the money spent on school facilities will have a greater impact and education will be more rewarding when, collectively, teenagers, parents, teachers and school governors start to take sleep seriously. In the universal language of school reports: we must do better. In the US and UK, several schools that have delayed the start of the school day witnessed a progress in academic performance.
A.nations which send sailors around the globe will be stronger
B.nations which develop physics and astronomy will be stronger
C.nations which support science exploration will be stronger
D.nations which dominate the world will be stronger
A.Because they make science exciting.
B.Because they promote economic growth.
C.Because they increase Americas national power.
D.Because they show what technology can bring.
A.pay more attention to historical records
B.do not publicize weather too much
C.control increase in population
D.do not blame man for global warming
B.They went to seek their luck to become heroes.
C.They went out to get more work opportunities.
D.They wanted to move to new places.
Questions下列各 are based on the following passage. The federal automobile efficiency standards announced this week are an important step on Americas path to a lower-carbon and more-secure energy future. They are expected to yield multiple benefits: reduced dependence on foreign oil, fewer greenhouse gas emissions, consumer savings at the pump and a more competitive auto industry. They may also serve as proof that well-tailored government regulation can achieve positive results and that consensus among old enemies--in this case environmentalists and the car companies--is possible even at a time of partisan (党派的) disagreement. The standards build on a 2009 agreement that established a unified set of rules governing fuel economy and carbon dioxide pollution from automobiles and light tracks. Those rules covered model years 2012-16 ; the new rules cover 2017 to 2025. Taken together, the two sets of rules would increase fuel efficiency from todays average of about 29 miles per gallon to 54.5 miles per gallon when they are fully effective in 2025. This is expected to result in a cut of 40 percent to 50 percent in fuel consumption and roughly equivalent cuts in greenhouse gas emissions. The White House says the rules would reduce oil consumption by two million barrels a day by 2025;the nation now consumes 19 million barrels a day and imports just less than haft that amount. And while fuel-efficient cars will cost more initially, lower fuel use is expected to save consumers up to $8,000 over the life of their vehicles. The battle for greater fuel economy goes back years and involved many players: California, which in2002 passed its own law regulating greenhouse gas emissions from vehicles sold there; environmenttalists,who pressured the Environmental Protection Agency to impose similar rules nationwide; the Supreme Court, which in 2007 authorized the agency to move forward; and Congress, which ordered the Department of Transportation to update fuel economy standards that had been largely untouched since 1975. President Obamas contribution was to bring about a consensus among the agencies, the states, the automakers and the interest groups on federal and state standards that reduced fuel use and gave industry the regulatory certainty it needed to move forward. It is a model of public-private cooperation. Even so, the Romney campaign has called the rules "extreme" and House Republicans have threatened to roll them back. That would be a grave harm to consumers, the auto companies, the economy and the planet. The federal automobile efficiency standards announced this week______.
A.help to eliminate partisan disagreement between the two parties
B.enable Americans to be independent from foreign oil
C.help to promote consumption of gas and automobiles
D.can result in a lower-carbon and more-secure energy future
B.They have already done enough for their life.
C.There is still a lot of work needed to be done.
D.There is only a step away from complete success.
A.All the New Yorkers are equal.
B.The plan may be reconsidered.
C.Necessary changes can be made.
D.No one would enjoy any privilege.
警告：系统检测到您的账号存在安全风险
为了保护您的账号安全，请在“简答题”公众号进行验证，点击“官网服务”-“账号验证”后输入验证码“”完成验证，验证成功后方可继续查看答案！
