过敏反应属于
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A．体液免疫B．细胞免疫C．自身免疫D．免疫缺陷
相关问题推荐
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The campaign is over. The celebrations have ended. And the work for US president-elect Barack Obama has begun. The 47-year-old politician rose to the highest post because of his stand against the war in Iraq and his plans to fix a weak economy. But what will the first 47-year-old African-American president do for race relations. Obama’s victory appears to have given blacks and other minorities a true national role model. For years, many looked to athletes and musicians for inspiration. As Darius Turner, an African-American high school student in Los Angeles, told the Los Angeles Times.“Kobe（the basketball player) doesn’t have to be everybody’s role model anymore.” Recent polls also suggest that Obama’s victory has given Americans new optimism about race relations. For example, a USA Today poll found that two-thirds of Americans believe relations between blacks and whites“will finally be worked out”. This is the most hopeful response since the question was first asked during the civil rights revolution in 1963. However, it’s still too early to tell whether Obama’s presidency will begin to solve many of the social problems facing low-income black communities. Although blacks make up only 13 percent of the US population, 55 percent of all prisoners are African-American. Such numbers can be blamed on any number of factors on America’s racist past, a failure of government policy and the collapse of the family unit in black communities. It is unlikely that Obama will be able to reverse（扭转）such trends overnight. However, Bill Bank, an expert of African-American Studies, say that eventually young blacks need to find role models in their own communities.“That’s not Martin Luther King, and not Barack Obama,”he told the Los Angeles Times, “It’s actually the people closest to them. Barack only has so much influence.” In the opinion of black British politician Trevor Phillips, Obama’s rise will contribute more to multiculturalism than to race relations in the US. 52: For years, before Obama was elected president of the US, . A. Kobe was the only role model for all the blacks B. blacks could only find role models on the basketball court C. minorities in America couldn’t find role models in their real life D. American blacks had no role model who was successful in political area
According to Bill Bank, .A. Obama is not the proper role model for African-Americans B. young blacks should not be so much influenced by Obama C. blacks should find other role models because Obama is far from their reality D. it’s better for young blacks to find role models in those who are close to them
What do you think the author is probably going to talk about in the next paragraph？A. In what ways Obama will contribute to racial relations in the US. B. How Obama will influence Americans as a national role model. C. How Obama will contribute to multiculturalism in the US. D. How to choose a role model in his community as a young black. 55.What would be the best title for this passage？ A. The First African-American President B. America’s New Role Model C. Obama—a Successful Black D. Choosing a Right Role Model
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阅读下面的宋词，完成下面问题。
**声声慢**李清照
寻寻觅觅，冷冷清清，凄凄惨惨戚戚。乍暖还寒时候，最难将息。三杯两盏淡酒，怎敌他晚来风急。雁过也，正伤心，却是旧时相识。 满地黄花堆积。憔悴损，如今有谁堪摘。守著窗儿，独自怎生得黑。梧桐更兼细雨，到黄昏点点滴滴。这次第，怎一个愁字了得！1、下列关于《声声慢》的分析，错误的一项是
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A、本词是李清照后期的代表作之一。当时诗人因国破家亡，流落异乡。全词抒写了个人遭遇与亡国之痛交织在一起的哀愁，情调哀伤凄苦。B、叠词的运用是本词的一大亮点。开头连用七组叠字，声情并茂，把诗人哀愁忧伤、惆怅迷惘的内心感受和凄清寂寞的外在环境融为一体。C、本词语言含蓄典雅。诗人选取了急风、飞雁、黄花、梧桐、细雨等一连串具有典型意义的景物，抒写内心的忧伤，似是信手拈来，实则精雕细琢。D、全词借景抒情，透过乍暖还寒，晚来风急、旧时雁过、满地黄花、梧桐细雨等景象，表现诗人孤寂、凄凉、悲伤、哀愁的心境。2、下列诗句与例句中所运用的艺术手法不相同的一项是
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例句：梧桐更兼细雨，到黄昏点点滴滴。A、今宵酒醒何处？杨柳岸晓风残月。B、渐黄昏，清角吹寒，都在空城。C、凭阑拂袖杨花雪。溪又斜，山又遮，人去也。D、四十三年，望中犹记，烽火扬州路。
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阅读下面的唐诗，回答下面问题。
从军行（其四）王昌龄青海长云暗雪山，孤城遥望玉门关。黄沙百战穿金甲，不破楼兰终不还。
1、下列关于《从军行》主题内容的理解，错误的一项是
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A、第一二句描写青海湖上大片云朵，映衬远处的雪山，孤城戍守，玉关屹立。景物色彩鲜明，显示边塞的壮阔景象，奠定豪放基调。B、“黄沙百战穿金甲”是概括力极强的诗句。戍边时间之漫长，战事之频繁，战斗之艰苦，敌军之强悍，边地之荒凉，都于此七字中概括无遗。C、一二两句境界阔大，感情悲壮。三四两句之间有转折。“黄沙”句尽管写出了战争的艰苦，但给人的感受是雄壮有力，而不是低沉伤感的。D、末句并非嗟叹归家无日，而是在意识到战争的艰苦漫长的基础上发出更坚定深沉的誓言。在抒写戍边将士的豪情壮志时，并不回避战争的艰苦。2、下列关于《从军行》艺术手法的分析，错误的一项是
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A、前两句描写壮阔悲凉的环境，很好地烘托了戍边将士的豪情壮志。B、“孤城遥望玉门关”应为“遥望孤城玉门关”，用倒装句是为了突出孤城戍守的悲凉。C、青海和玉门关相距甚远，诗人却突破空间界限，将之组合在一起，显得大气磅礴。D、本诗的结尾融情于景，气象浑茫、含蓄丰富地展现边塞战士的豪情壮志。
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In “Relax, We’ll Be Fine”, columnist David Brooks writes, “the fact is, despite all the problems, America’s future is extremly bright.”
Mr. Brooks acknowledges that “According to recent survey, 60 percent of Americans think the country is heading in the wrong direction. The same percentage believe that the U.S. is in long-term decline. The political system is not functional. A financial crisis looks unavoidable. There are plenty of reasons to be sad.”
But, he writes:
“Demographers（人口学家) predict that over the next 40 years, the U.S. population will increase by an additional 100 million people, to 400 million over all. The population will be determined, hardworking and relatively young. In 2050, only a quarter will be over 60, compared with 31 percent in China and 41 percent in Japan.”
As the rising generation leads an economic recovery, it will also participate in a communal
（of community) one. We are living in a global age of social entrepreneurship（创业精神).
In sum, the U.S. is on the edge of a demographic, economic and social recovery, built on its historic strengths. The U.S. has always been good at destructive change. And it’s always been good at decentralized community-building, too. Surely a country with this much going for it is not going to wait around passively and let a rotten political culture drag it down.
51．In his article Relax, We’ll Be Fine, David Brooks intends to________.
A．encourage Americans to be optimistic about their future
B．give Americans courage to face their financial crisis
C．persuade Americans to live happily and generously
D．inspire Americans to lead an economic recovery
52．There are all the reasons for Americans to be unhappy except____
A．the function-failed political system B．the increasing population
C．the declining economy D．the wrong direction and financial crisis
53．Over the next 40 years, according to David Brooks, Americans will be____
A．more optimistic and humorous B．more pessimistic and stronger
C．more energetic and promising D．more considerate and aggressive
54．In the author’s opinion, America________.
A．has always benefited from wars B．has done well by its political system
C．has contributed a lot to human progress D．has contributed to world’s economy
55．We can learn from the passage that____
A．American political system and culture are backward
B．Americans are not a nation to give in to difficulties
C．Americans are very destructive and aggressive
D．America has been in an economic and social recovery -
You can be proud of yourselves, even if you can only make one or two of these green changes. The goal here is to limit carbon dioxide and other greenhouse gases, which are closely associated to the big problem of global-warming. Strategy 1: Bring your own cup to Starbucks You’ll get a 10 cent discount, and it’s one less paper cup to end up in a landfill. While you’re there, pick up some free bags of spent coffee grounds to use as ‘‘green’’ fertilizer in your garden. The payoff: The store won’t create more waste when they throw away a cup. Strategy2: Turn off your computer When in standby mode, your PC is still using energy. In fact, 75percent of electricity used in your home comes from electronics that are turned off. The payoff: Turning off a monitor for 40 hours a week may only save $5 a month, but it reduces CO2 by 750 pounds Strategy 3: Reuse plastic bags Instead of throwing away 100 billion plastic bags a year, try and get a second, third, or tenth use out of them. Better yet, next time you shop, try a reusable bag. The payoff: You’re reducing pollution. The amount of oil it would take to make just 14 plastic bags would run your car for one mile. Strategy4: Use recycled paper in the bathroom Most of the toilet paper we use is made from trees found in forests previously untouched by humans. The payoff: If every household replaced one roll of toilet paper with a recycled one, 424000 trees would still be standing. Look for eco-paper towels too. Strategy5: Buy energy-efficient appliances（电器） Replace the old fridge with an Energy Star appliance and you’ll use 15 percent less energy. It might be a little expensive to buy, but you’ll save money on your electricity bills and help the environment. The payoff: If we all used one Energy Star appliance at home, it would be like planting 1. 7 million acres of new trees. Strategy 6: Plant a tree Adding green to your garden is beautiful and earth-pleasing. The payoff: Just one tree will help make cleaner air and save the environment from 5000 pounds of hot carbon dioxide each year.
What is the best title for the passage？A. Ways to save money at home B. Ways to be earth-friendly C. Ways to end global-warming D. Ways to limit carbon dioxide
What benefits do these strategies have in common？A. They all help reduce the use of energy like electricity. B. They all cut down the amount of the paper. C. They all result in producing less greenhouse gases. D. They all help to preserve our trees and forest. 56．Which strategies suggest recycling or reuse of things？ A．Strategies 1&3 B．Strategies 2&5 C．Strategies 3&6 D．Strategies 4&5.