[不定项选择题]Moods, say the experts, are feelings that are likely to become fixed, having effects on one′ s out-look ( way of looking at things ) for hours, days or even weeks. That′ s great if your mood is a pleasant one, but a problem if you are sad, anxious, angry or simply lonely. Perhaps the best way to deal with such moods is to talk them out; sometimes, though, there is no one to listen. Modern pharmacology (药物学) offers a lot tranquilizers ( 镇定剂 ) and anti-anxiety drugs. What many people don′ t realize, however, is that scientists have discovered the effectiveness of several non-drug methods to make you free from an unwanted mood. These can be just as useful as drugs, and have the added benefit of being nonpoisonous. So next time you feel out of sorts, don′ t head for the drug store--try the following method. Of all the mood-changing self-help techniques, aerobic exercise seems to be the best cure for a bad mood. "If you could keep the exercise, you′ d be in high spirits, "says Kathryn Lance, author of Running for Health and Beauty. Researchers have explained biochemical and various other changes that make exercise compare favorably to drugs as mood-raiser. Physical work such as housework, however, does little. The key is aerobic exercise--running, cycling, walking, swimming, or other repetitive and sustained activities that increase the heart rate and circulation (循环), and improve the body′ s use of oxygen. Do them for at least 20 minutes a time, three to five times a week. Which of the following best describes the organization of this passage?
A.An exercise and its importance are explained.
B.A problem is examined and solutions are given.
C.Two different views of a problem are presented.
D.Recent developments in medicine are described.

[不定项选择题]Moods, say the experts, are feelings that are likely to become fixed, having effects on one′ s out-look ( way of looking at things ) for hours, days or even weeks. That′ s great if your mood is a pleasant one, but a problem if you are sad, anxious, angry or simply lonely. Perhaps the best way to deal with such moods is to talk them out; sometimes, though, there is no one to listen. Modern pharmacology (药物学) offers a lot tranquilizers ( 镇定剂 ) and anti-anxiety drugs. What many people don′ t realize, however, is that scientists have discovered the effectiveness of several non-drug methods to make you free from an unwanted mood. These can be just as useful as drugs, and have the added benefit of being nonpoisonous. So next time you feel out of sorts, don′ t head for the drug store--try the following method. Of all the mood-changing self-help techniques, aerobic exercise seems to be the best cure for a bad mood. "If you could keep the exercise, you′ d be in high spirits, "says Kathryn Lance, author of Running for Health and Beauty. Researchers have explained biochemical and various other changes that make exercise compare favorably to drugs as mood-raiser. Physical work such as housework, however, does little. The key is aerobic exercise--running, cycling, walking, swimming, or other repetitive and sustained activities that increase the heart rate and circulation (循环), and improve the body′ s use of oxygen. Do them for at least 20 minutes a time, three to five times a week. "Feel out of sorts", as it is used in the second paragraph, could best be replaced by
A.put things in order
B.are in a bad mood
C.search for tranquilizers
D.want a mood-raiser

[不定项选择题]It would be all too easy to say that Facebook’s market meltdown is coming to an end.After all,Mark Zuckerberg’s social network burned as much as$50 billion of shareholders’wealth in just a couple months.To put that in context,since its debut(初次登台)on NASDAQ in May,Facebook has lost value nearly equal to Yahoo,AOL,Zynga,Yelp,Pandora,Open Table, Group on,LinkedIn,and Angie's List combined,plus that of the bulk of the publicly traded newspaper industry: As shocking as this utter failure may be to the nearly 1 billion faithful Facebook users around the world,it’s no surprise to anyone who read the initial public offering(IPO)prospectus(首次公开募股说明书).Worse still,all the crises that emerged when the company debuted-overpriced shares,poor corporate governance,huge challenges to the core business,and a damaged brand-remain today.Facebook looks like a prime example of what Wall Street calls a falling knife-that is,one that can cost investors their fingers if they try to catch it. Start with the valuation.To justify a stock price close to the lower end of the projected range in the IPO,say$28 a share,Facebook’s future growth would have needed to match that of Google seven years earlier.That would have required increasing revenue by some 80 percent annually and maintaining high profit margins all the while. That’s not happening.In the first half of 2012,Facebook reported revenue of$2.24 billion,up 38 percent from the same period in 2011.At the same time,the company’s costs surged to$2.6 billion in the six-month period. This so-so performance reflects the Achilles’heel of Facebook’s business model,which the company clearly stated in a list of risk factors associated with its IPO:it hasn’t yet figured out how to advertise effectively on mobile devices,The number of Facebook users accessing the site on their phones surged by 67 percent to 543 million in the last quarter,or more than half its customer base. Numbers are only part of the problem.The mounting pile of failure creates a negative feedback loop that threatens Facebook’s future in other ways.Indeed,the more Facebook’s disappointment in the market is catalogued,the worse Facebook’s image becomes.Not only does that threaten to rub off on users,it’s bad for recruitment and retention of talented hackers,who are the lifeblood of Zuckerberg’s creation. Yet the brilliant CEO can ignore the sadness and complaints of his shareholders thanks to the super-voting stock he holds.This arrangement also was fully disclosed at the time of the offering.It’s a pity so few investors apparently bothered to do their homework. What does the author imply in the last paragraph 《》（）
A.Sleeplessness does harm to people’s health.
B.Few people really know the importance of sleep.
C.It is important to study our sleep patterns.
D.Average people probably sleep less than the rich.

[不定项选择题]共用题干 A家具生产企业木加工车间内有油漆木制件的砂、抛、磨加工等工序，车间内有有机溶剂和废弃的油漆桶等。车间的除尘净化系统采用反吹布袋除尘器。因新增了设备并扩大了生产规模，致使车间内粉尘浓度超标。为了治理车间内粉尘污染，将布袋除尘器由原有的4套增加到8套，车间内木粉尘浓度经处理后小于10mg/m³。
2 0 0 8年7月5日9时2 0分，除尘净化系统3号除尘器内发生燃爆着火，并瞬间引起4号除尘器内燃爆着火，造成燃爆点周边20m范围内部分厂房和设施损坏。由于燃爆区域内当时无人，未造成人员伤亡。
根据以上场景，回答下列问题（共14分，每小题2分，1～3题为单选题，4～7题为多选题）： 根据《火灾分类》(GB4968-1985)，按物质的燃烧特性划分，此次事故属于 ( )
A.A类火灾
B.B类火灾
C.C类火灾
D.D类火灾
E.E类火灾