单选题朱红：红松鼠在糖松的树皮上打洞以吸取树液。既然糖松的树液主要是由水和少量的糖组成的，这就大致可以确定红松鼠是为了寻找水或糖。水在松树生长的地方很容易通过其他方式获得。因此，红松鼠不会是因为找水而费力地打洞，它们可能是在寻找糖。 林娜：红松鼠一定不是找糖而是找其他什么东西，因为糖松树液中糖的浓度太低了，红松鼠必须饮用大量的树液才能获得一点点糖。

单选题八个部委联合宣布“网络游戏防范沉迷系统”及配套的《网络游戏防范沉迷系统实名认证方案》正式实施，未成年人玩网络游戏超过5小时，经验值和收益将计为0。这一方案的实施，将有效地防止未成年人沉迷于网络游戏。 以下哪项说法如果正确，能够最有力地削弱上述论证?

单选题 经济学中短期与长期的划分取决于（ ） A、时间长短 B、可否调整产量 C、可否调整产品价格 D、可否调整生产规模

单选题不符合卫生标准的容器不能盛装食用品，很多塑料容器不符合卫生标准。某些塑料容器虽然符合卫生标准，但对盛装的物品有一定的要求。如有的塑料容器可以盛装饮料、糕点等食用品，却不能盛装食用油。 由此可以推出以下哪一项?

单选题所谓“凯思斯陷阱”一般产生于债券价格的( )．

单选题研究财政支出结构的经济效应具有重要意义，因其对宏观经济变量产生直接影响，不过以下_______不属于财政支出结构的经济效应。①增长效应 ②排挤效应 ③财务效应④储蓄效应 ⑤组织效应 ⑥消费效应

单选题老王在A市有两套住房，一套自己居住，另一套闲置。老张是老王的朋友，一直居住在B市，现由于工作原因，需要在A市长期租住。老张希望租老王闲置的那套房子，老王说： “我女儿两个月后大学毕业，如果她毕业后不回A市工作生活，我就把房子出租给你。”下列选项中，哪些为真，可以证明老王没有说真话? (1)老王的女儿毕业后留在C市工作生活，老王拒绝把房子租给老张； (2)老王的女儿毕业后回到A市工作生活，老王把房子租给老张； (3)老王的女儿毕业后回到A市工作生活，老王拒绝把房子租给老张。

单选题In America and Europe magazine publishers have a common headache: total circulation is either flat or declining slightly as people devote more time to the internet, and an ever greater share of advertising spending is going online. Magazine units are mostly a drag on growth for their parents. Time Inc, the world' s biggest magazine company, has to fend off rum ours that its parent, Time Warner, will sell it. People in the industry expect that Time Warner will soon sell IPC Media, its British magazine subsidiary. The business model for consumer magazines is under pressure from several directions at once, both online and off. Magazines have become more expensive to launch, and the cost of attracting and keeping new subscribers has risen. In America newsstand sales have been worryingly weak, partly because supermarkets dominate distribution and shelf-space is in short supply. The internet's popularity has hit men's titles the hardest. FHM, the flagship "lads" magazine of Emap—a British media firm, for instance, lost a quarter of its circulation in the year to June. Not long ago consumer magazines were Emap's prize asset, but slowing growth from the division contributed to the company's decision to put itself up for sale. Men's magazines are in trouble in most developed-world markets as people have quickly switched from magazines to online services. There are good reasons why magazine owners should not feel pessimistic, however. For readers, many of the pleasing characteristics of magazines—their portability and glossiness, for instance— cannot be matched online. And magazines are not losing younger readers in the way that newspapers are. According to a study by the digital arm of Ogilvy Group, appetite for magazines is largely unchanged between older "baby boomers" and young "millennials". On the advertising side, magazines are faring much better than newspapers, which are losing big chunks of revenue as classified advertising shifts online. Advertisers like the fact that in many genres, such as fashion, readers accept and value magazine ads and even consider them part of the product. Unfortunately, magazine publishers have been slow to get onto the internet. "Eighteen months ago the internet was something they worried about after 4pm on Friday," says Peter Kreisky, a consultant to the media industry, "but now it's at the heart of their business model. " To their credit, however, big magazine firms are doing far more than reproducing their print products online. They offer people useful, fun services online—Lagardere' s Car and Driver website, for instance, offers virtual test drives, and Better Homes and Gardens online has a 3D planning tool to help people redesign their homes.

单选题不属于我国社保制度构成的内容

单选题在国际贸易相关法律上所指的倾销应包括____________。 　　①产品低于正常价值或公平价值销售 　　②这种低价销售行为对进口国的相关产业造成了损害 　　③损害与低价之间存在因果联系 　　④低价销售是长期持续的

单选题一个已经公认的结论是，北美洲人的祖先来自亚洲。至于亚洲人是如何到达北美的，科学家们一直假设，亚洲人是跨越在14000年以前还连接着北美和亚洲后来沉入海底的陆地才进入北美的，在艰难的迁徙途中，他们靠捕猎沿途陆地上的动物为食。最近的新发现导致了一个新的假设，亚洲人是驾船沿着上述陆地的南部海岸，沿途以鱼和海洋生物为食而进入北美的。 以下哪项如果为真，最能使人有理由在两个假设中更相信后者?______

单选题有三个可行的投资方案，按投资由小到大的顺序为A、B、C，其差额投资回收期分别 为T B-A＝4年，T C-A＝3年，T C-B＝6年。若基准投资回收期为5年，则方案从优到劣的顺序为（ ）

单选题 收入政策主要是用来对付（ ）。 A、需求拉上型通货膨胀 B、成本推动型通货膨胀 C、结构型通货膨胀 D、以上各类型

单选题A pair of dice, rolled again and again, will eventually produce two sixes. Similarly, the virus that causes influenza is constantly changing at random and, one day, will mutate in a way that will enable it to infect billions of people, and to kill millions. Many experts now believe a global outbreak of pandemic flu is overdue, and that the next one could be as bad as the one in 1918, which killed somewhere between 25m and 50m people. Today however, advances in medicine offer real hope that another such outbreak can be contained—if governments start preparing now. New research published this week suggests that a relatively small stockpile of an antiviral drug—as little as 3m doses—could be enough to limit sharply a flu pandemic if the drugs were deployed quickly to people in the area surrounding the initial outbreak. The drug's manufacturer, Roche, is talking to the World Health Organisation about donating such a stockpile. This is good news. But much more needs to be done, especially with a nasty strain of avian flu spreading in Asia which could mutate into a threat to humans. Since the SARS outbreak in 2003 a few countries have developed plans in preparation for similar episodes. But progress has been shamefully patchy, and there is still far too little international coordination. A global stockpile of drugs alone would not be much use without an adequate system of surveillance to identify early cases and a way of delivering treatment quickly. If an outbreak occurred in a border region, for example, a swift response would most likely depend on prior agreements between different countries about quarantine and containment. Reaching such agreements is rarely easy, but that makes the task all the more urgent. Rich countries tend to be better prepared than poor ones, but this should be no consolation to them. Flu does not respect borders. It is in everyone's interest to make sure that developing countries, especially in Asia, are also well prepared. Many may bridle at interference from outside. But if richer nations were willing to donate anti-viral drugs and guarantee a supply of any vaccine that becomes available, poorer nations might be willing to reach agreements over surveillance and preparedness. Simply sorting out a few details now will have lives (and recriminations) later. Will there be enough ventilators, makes and drugs? Where will people be treated if the hospitals overflow? Will food be delivered as normal? Too many countries have no answers to these questions.

单选题货币供给的内生性是指（）。