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已知x2-x+a-3是一个完全平方式，则a=( )

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甲乙两组射手打靶，乙组平均成绩为171.6环，比甲组平均成绩高出30%，而甲组人数比乙组人数多20%，而甲，乙两组射手的总平均成绩是（）.

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若圆的方程是x²+y²=1，则它的右半圆(在第一象限和第四象限内的部分)的方程是（）.

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What would you do with $590m? This is now a question for Gloria Mackenzie, an 84-year-old widow who recently emerged from her small, tin-roofed house in Florida to collect the biggest undivided lottery jackpot in history. If she hopes her new-found fortune will yield lasting feelings of fulfillment, she could do worse than read Happy Money by Elizabeth Dumn and Michael Norton.These two academics use an array of behavioral research to show that the most rewarding ways to spend money can be counterintuitive. Fantasies of great wealth often involve visions of fancy cars and extravagant homes. Yet satisfaction with these material purchases wears off fairly quickly. What was once exciting and new becomes old-hat; regret creeps in. It is far better to spend money on experiences, say Ms. Dunn and Mr. Norton, like interesting trips, unique meals or even going to the cinema. These purchases often become more valuable with time—as stories or memories—particularly if they involve feeling more connected to others.This slim volume is packed with tips to help wage slaves as well as lottery winners get the most “happiness bang for your buck. ” It seems most people would be better off if they could shorten their commutes to work, spend more time with friends and family and less of it watching television ( something the average American spends a whopping two months a year doing, and is hardly jollier for it). Buying gifts or giving to charity is often more pleasurable than purchasing things for oneself, and luxuries are most enjoyable when they are consumed sparingly. This is apparently the reason McDonald’s restricts the availability of its popular McRib---a marketing trick that has turned the pork sandwich into an object of obsession.Readers of Happy Money are clearly a privileged lot，anxious about fulfillment, not hunger. Money may not quite buy happiness, but people in wealthier countries are generally happier than those in poor ones. Yet the link between feeling good and spending money on others can be seen among rich and poor people around the world, and scarcity enhances the pleasure of most things for most people. Not everyone will agree with the authors’ policy ideas, which range from mandating more holiday time to reducing tax incentives for American homebuyers. But most people will come away from this book believing it was money well spent.1.According to Dumn and Norton, which of the following is the most rewarding purchase?2.The author’s attitude toward Americans’ watching TV is （）.3.McRib is mentioned in paragraph 3 to show that （）. 4.According to the last paragraph, Happy Money （）. 5.This text mainly discusses how to（）.

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It is curious that Stephen Koziatek feels almost as though he has to justify his efforts to give his students a better future.Mr.Koziatek is part of something pioneering. He is a teacher at a New Hampshire high school where learning is not something of books and tests and mechanical memorization, but practical. When did it become accepted wisdom that students should be able to name the 13th president of the United States but be utterly overwhelmed by a broken bike chain?As Koziatek knows, there is learning in just about everything. Nothing is necessarily gained by forcing students to learn geometry at a graffitied desk stuck with generations of discarded chewing gum. They can also learn geometry by assembling a bicycle.But he's also found a kind of insidious prejudice. Working with your hands is seen as almost a mark of inferiority. Schools in the family of vocational education “have that stereotype, that it's for kids who can't make it academically,” he says.On one hand, that viewpoint is a logical product of America's evolution. Manufacturing is not the economic engine that it once was. The job security that the US economy once offered to high school graduates has largely evaporated. More education is the new principle. We want more for our kids, and rightfully so.But the headlong push into bachelor's degrees for all -and the subtle devaluing of anything less-misses an important point: That's not the only thing the American economy needs. Yes, a bachelor's degree opens more doors. But even now, 54 percent of the jobs in the country are middle-skill jobs, such as construction and high-skill manufacturing. But only 44 percent of workers are adequately trained.In other words, at a time when the working class has turned the country on its political head, frustrated that the opportunity that once defined America is vanishing, one obvious solution is staring us in the face. There is a gap in working-class jobs, but the workers who need those jobs most aren't equipped to do them. Koziatek's Manchester School of Technology High School is trying to fill that gap.Koziatek's school is a wake-up call. When education becomes one-size-fits-all, it risks overlooking a nation's diversity of gifts.1.A broken bike chain is mentioned to show students' lack of （）.2.There exists the prejudice that vocational education is for kids who （）. 3.We can infer from Paragraph 5 that high school graduates （）. 4.The headlong push into bachelor's degrees for all （）. 5.The author's attitude toward Koziatek's school can be described as（）.

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Forests give us shade, quiet and one of the harder challenges in the fight against climate change. Even as we humans count on forests to soak up a good share of the carbon dioxide we produce, we are threatening their ability to do so. The climate change we are hastening could one day leave us with forests that emit more carbon than they absorb.Thankfully, there is a way out of this trap—but it involves striking a subtle balance. Helping forests flourish as valuable “carbon sinks” long into the future may require reducing their capacity to sequester carbon now. California is leading the way, as it does on so many climate efforts, in figuring out the details.The state’s proposed Forest Carbon Plan aims to double efforts to thin out young trees and clear brush in parts of the forest, including by controlled burning. This temporarily lowers carbon―carrying capacity. But the remaining trees draw a greater share of the available moisture, so they grow and thrive, restoring the forest’s capacity to pull carbon from the air. Healthy trees are also better able to fend off bark beetles. The landscape is rendered less combustible. Even in the event of a fire, fewer trees are consumed.The need for such planning is increasingly urgent. Already, since 2010, drought and beetles have killed more than 100 million trees in California, most of them in 2016 alone, and wildfires have scorched hundreds of thousands of acres.California plans to treat 35,000 acres of forest a year by 2020, and 60,000 by 2030—financed from the proceeds of the state’s emissions-permit auctions. That’s only a small share of the total acreage that could benefit, about half a million acres in all, so it will be vital to prioritize areas at greatest risk of fire or drought.The strategy also aims to ensure that carbon in woody material removed from the forests is locked away in the form of solid lumber, burned as biofuel in vehicles that would otherwise run on fossil fuels, or used in compost or animal feed. New research on transportation biofuels is under way, and the state plans to encourage lumber production close to forest lands. In future the state proposes to take an inventory of its forests’ carbon-storing capacity every five years.State governments are well accustomed to managing forests, including those owned by the U.S. Forest Service, but traditionally they’ve focused on wildlife, watersheds and opportunities for recreation. Only recently have they come to see the vital part forests will have to play in storing carbon. California’s plan, which is expected to be finalized by the governor early next year, should serve as a model.1.By saying “one of the harder challenges,” the author implies that（）.2.To maintain forests as valuable “carbon sinks,” we may need to （）. 3.California’s Forest Carbon Plan endeavors to （）. 4.What is essential to California’s plan according to Paragraph 5?5.The author’s attitude to California’s plan can best be described as（）.

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The Japanese dollar-buying makes traders eager to（）dollars in fear of another government intervention.

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某大学的哲学学院和管理学院今年招聘新教师，招聘结束后受到了女权主义代表的批评，因为他们在12名女性应聘者中录用了6名，但在12名男性应聘者中却录用了7名。该大学对此解释说：今年招聘新教师的两个学院中，女性应聘者的录用率都高于男性应聘者的录用率。具体情况是：哲学学院在8名女性应聘者中录用了3名，而在3名男性应聘者中录用了1名；管理学院在4名女性应聘者中录用了3名，而在9名男性应聘者中录用了6名。以下哪项最有助于解释女权主义代表和大学之间的分歧？

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作为一名环保爱好者，赵博士提倡低碳生活，积极宣传节能减排。但我不赞同他的做法，因为作为一名大学老师，他这样做，占用了大量的科研时间，到现在连副教授都没有评上，他的观点怎么能令人信服呢？以下哪项论证中的错误和上述最为相似？

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补充胶原蛋白已经成为当下很多女性抗衰老的手段之一。她们认为：吃猪蹄能够补充胶原蛋白，为了美容养颜，最好多吃些猪蹄。近日有些专家对此表示质疑，他们认为多吃猪蹄其实并不能补充胶原蛋白。以下哪项如果为真，最能质疑上述专家的观点？

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节日将至，某单位拟为职工发放福利品，每人可在甲、乙、丙、丁、戊、己、庚7种商品中选择其中的4种进行组合，且每种组合还要满足如下要求：（1）若选择甲，则丁、戊、庚3种中至多选择其一。（2）若丙、己2种中至少选择1种，则必选择乙但不能选择戊。以下哪项组合符合上述要求？

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贾研究员：4万年前，尼安德特人的灭绝不是因为智人的闯入，而是近亲繁殖导致的恶果。尹研究员：事情并非如此，因为尼安德特人当时已经“濒危”。种群个体数量的减少，不仅会给个体健康带来负面影响，而且一旦种群的出生率、死亡率或性别比发生偶然变动，就会直接导致种群的灭绝。以下哪项如果为真，最能支持尹研究员的观点（）。

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甲、乙、丙三人的年收入成等比数列，则能确定乙的年收入的最大值。（1）已知甲、丙两人的年收入之和。（2）已知甲、丙两人的年收入之积。

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若一球体的表面积增加到原来的9倍，则它的体积（）.

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