正确答案: A

初级主动运输

题目：植物细胞中质子泵利用ATP水解释放的能量，逆电化学势梯度跨膜转运H+，这一过程称为

解析：A

查看原题 点击获取本科目所有试题

举一反三的答案和解析：

[单选题]发展先进文化的重要内容和中心环节是 （ ）

社会主义思想道德建设

[单选题]Passage 4 The world is going through the biggest wave of mergers and acquisitions ever witnessed. The process sweeps from hyperactive America to Europe and reaches the emerging countries with unsurpassed might. Many in these countries are looking at this process and worrying:“Won't the wave of business concentration turn into an uncontrollable anti-competitive force?"

There's no question that the big are getting bigger and more powerful. Multinational corporations accounted for less than 20% of international trade in 1982. Today the figure is more than 25% and growing rapidly. International affiliates account for afastgrowing segment of production in economies that open up and welcome foreign investment. In Argentina, for instance, after the reforms of the early 1990s, multinationals went from 43% to almost 70% of the industrial production of the 200 largest firms. This phenomenon has created serious concerns over the role of smaller economic firms, of national businessmen and over the ultimate stability of the world economy. I believe that the most important forces behind the massive M&A wave are thesame that underlie the globalization process: falling transportation and communication costs, lower trade and investment barriers and enlarged markets that require enlarged operations capable of meeting customers' demands. All these are beneficial, not detrimental, to consumers. As productivity grows, the world's wealth increases. Examples of benefits or costs of the current concentration wave are scanty. Yet it is hard to imagine that the merger of a few oil firms today could recreate the same threats to competition that were feared nearly a century ago in the U.S., when the Standard Oil trust was broken up. The mergers of telecom companies, such as World Com, hardly seem to bring higher prices for consumers or a reduction in the pace of technical progress. On the contrary, the price of communications is coming down fast. In cars, too, concentration is increasing — witness Daimler and Chrysler, Renault and Nissan — but it does not appear that consumers are being hurt. Yet the fact remains that the merger movement must be watched. A few weeks ago, Alan Greenspan warned against the megamergers in the banking industry. Who is going to supervise, regulate and operate as lender of last resort with the gigantic banks that are being created? Won't multinationals shift production from one place to another when a nation gets too strict about infringements to fair competition? And should one country take upon itself the role of “defending competition" on issues that affect many other nations, as in the U.S. vs. Microsoft case? 第63题：What is the typical trend of businesses today?

to combine and become bigger

解析：选［C］。文章的第一句即为本题提供了答案。原文中的mergers and acquisitions(合并与兼并)换成了被选项中的combine and become bigger。

[单选题]影响期权价格最主要因素为（ ）

协定价格与市场价格

[单选题]清末“预备立宪”的根本目的在于

延续清政府的统治

[单选题]

Because

[单选题]男性，28岁，不明原因发热40天，最高可达39℃伴寒战。近3周来感肝区胀痛波及右肩。既往曾患过“胆道蛔虫”和“菌痢”。查体：发热病容，巩膜可疑黄染，右上腹轻度膨起，肝区明显叩击痛。白细胞15×109/L中性粒细胞86%。此病人最可能的诊断是

细菌性肝脓肿

解析：

100．答案：A

[考点] 细菌性肝脓肿与阿米巴性肝脓肿及其他肝胆疾病的鉴别

[分析] 此病人考虑诊断时的依据是高热、肝区疼痛、肝肿大伴白细胞升高、核左移，结合既往有胆道蛔虫史应首先诊断肝脓肿，虽然阿米巴肝脓肿也可有发热、肝区疼痛和肝肿大，但临床表现不如细菌性肝脓肿急重，其次阿米巴肝脓肿病原体来自肠道的阿米巴原虫感染而不像细菌性肝脓肿源于胆道感染。所以应选A。此外，根据病人无胆囊炎的体征，也无胆绞痛表现以及病历中没有与肝包囊虫病有关的线索(如牧区生活、与包囊虫生活史有关的接触)，因此可以排除急性胆囊炎、胆管炎和肝包囊虫病的诊断。