单选题肠内营养发生腹胀、腹泻最主要的原因是

单选题以下哪种情况下，不应使用氧化亚氮

单选题最易与直肠脱垂相混淆的疾病是

单选题早期膝关节滑膜结核，除全身治疗及局部制动外，局部治疗首选

单选题最常出现发冷、发热的外科急腹症是

单选题In most parts of the world, climate change is a worrying subject. Not so in California. At a recent gathering of green luminaries—in a film star's house, naturally, for that is how seriousness is often established in Los Angeles—the dominant note was self-satisfaction at what the state has already achieved. And perhaps nobody is more complacent than Arnold Schwarzenegger. Unlike A1 Gore, a presidential candidate turned prophet of environmental doom, California's governor sounds cheerful when talking about climate change. As well he might: it has made his political career. Although California has long been an environmentally-conscious state, until recently greens were concerned above all with smog and redwood trees. "Coast of Dreams", Kevin Stag's authoritative history of contemporary California, published in 2004, does not mention climate change. In that year, though, the newly-elected Mr. Schwarzenegger made his first tentative call for western states to seek alternatives to fossil fuels. Gradually he noticed that his efforts to tackle climate change met with less resistance, and more acclaim, than just about all his other policies. These days it can seem as though he works on nothing else. Mr. Schwarzenegger's transformation from screen warrior to eco-warrior was completed last year when he signed a bill imposing legally-enforceable limits on greenhouse—gas emissions—a first for America. Thanks mostly to its lack of coal and heavy industry, California is a relatively clean state. If it were a country it would be the world's eighth-biggest economy, but only its 16th-biggest polluter. Its big problem is transport—meaning, mostly, cars and trucks, which account for more than 40% of its greenhouse-gas emissions compared with 32% in America as a whole. The state wants to ratchet down emissions limits on new vehicles, beginning in 2009. Mr. Schwarzenegger has also ordered that, by 2020, vehicle fuel must produce 10% less carbon: in the production as well as the burning, so a simple switch to corn-based ethanol is probably out. Thanks in part to California' s example, most of the western states have adopted climate action plans. When it comes to setting emission targets, the scene can resemble a posedown at a Mr. Olympia contest. Arizona's climate-change scholars decided to set a target of cutting the state's emissions to 2000 levels by 2020. But Janet Napolitano, the governor, was determined not to be out-muscled by California. She has declared that Arizona will try to return to 2000 emission levels by 2012. California has not just inspired other states; it has created a vanguard that ought to be able to prod the federal government into stronger national standards than it would otherwise consider. But California is finding it easier to export its policies than to put them into practice at home. In one way, California' s self-confidence is fully justified. It has done more than any other state—let alone the federal government—to fix America's attention on climate change. It has also made it seem as though the problem can be solved. Which is why failure would be such bad news. At the moment California is a beacon to other states. If it fails, it will become an excuse for inaction.

单选题 与生殖生物学相关的学科包括（ ） A、胚胎学 B、组织学 C、性医学 D、男科学 E、以上都是

单选题下列关于肺毛细血管楔压的叙述，恰当的是

单选题下列关于骨肿瘤的临床表现和诊断的叙述最正确的是

单选题The Bush administration is about to propose far-reaching new rules that would give people with disabilities greater access to tens of thousands of courtrooms, swimming pools, golf courses, stadiums, theaters, hotels and retail stores. The proposal would substantially update and rewrite federal standards for enforcement of the Americans With Disabilities Act, a landmark civil rights law passed with strong bipartisan support in 1990. The new rules would set more stringent requirements in many areas and address some issues for the first time, in an effort to meet the needs of an aging population and growing numbers of disabled war veterans. More than seven million businesses and all state and local government agencies would be affected. The proposal includes some exemptions for parts of existing buildings, but any new construction or renovations would have to comply. The new standards would affect everything from the location of light switches to the height of retail service counters, to the use of monkeys as "service animals" for people with disabilities, which would be forbidden'. The White House approved the proposal in May after a five-month review. It is scheduled to be published in the Federal Register on Tuesday, with 60 days for public comment. After considering those comments, the government would issue final rules with the force of law. Already, the proposal is stirring concern. The United States Chamber of Commerce says it would be onerous and costly, while advocates for disabled Americans say it does not go far enough. Since the disability law was signed by the first President Bush, advances in technology have made services more available to people with disabilities. But Justice Department officials said they were still receiving large numbers of complaints. In recent months, the federal government has settled lawsuits securing more seats for disabled fans at Madison Square Garden in New York and at the nation's largest college football stadium, at the University of Michigan. The Justice Department acknowledged that some of the changes would have significant costs. But over all, it said, the value of the public benefits, estimated at $ 54 billion, exceeds the expected costs of $ 23 billion. In an economic analysis of the proposed rules, the Justice Department said the need for an accessible environment was greater than ever because the Iraq war was "creating a new generation of young men and women with disabilities". John L. Wodatch, chief of the disability rights section of the Justice Department, said："Disability is inherent in the human condition. The vast majority of individuals who are fortunate enough to reach an advanced age will benefit from the proposed requirements. /

单选题A．儿童 B．青少年C．青年 D．壮年E．老年

单选题关于胃十二指肠大出血下列哪项正确？

单选题高血钾症患者禁忌食入

单选题急性肾小球肾炎的临床表现中，下列哪项为首发症状和患者就诊的原因

单选题 细菌种类繁多，按病原菌侵入机体生殖系后停留的主要部位不同，可将其分为胞外菌和胞内菌两大类，机体免疫系统可通过不同机制对胞外菌和胞内菌予以免疫清除。可直接杀伤胞内菌的特异性免疫细胞有 A、CTL细胞 B、Th 1细胞 C、Th2细胞 D、NK细胞 E、巨噬细胞

单选题A．发病前可有上呼吸道感染等感染因素 B．血尿C．两者皆有 D．两者皆无

单选题急性胰腺炎病人的解痉止痛，下列哪种药物不能应用

单选题 关于月经周期的叙述，错误的是： A、自青春期起，卵巢的活动呈现周期性变化 B、子宫内膜周期分为增生期、分泌期及月经期 C、卵巢周期分为卵泡期和黄体期 D、月经周期中出现两次雌激素分泌高峰 E、排卵的发生主要与LH和孕激素峰的出现有关

单选题唇痈最危险的并发症是

单选题A．高血糖素试验B．胰岛素低血糖试验C．酚妥拉明试验D．甲氧氯普胺刺激试验