单选题 University of York biologist Peter Mayhew recently found that global warming might actually increase the number of species on the planet, contrary to a previous report that higher temperatures meant fewer life forms—a report that was his own. In Mayhew's initial 2008 study, low biodiversity among marine invertebrates (无脊椎动物) appeared to coincide with warmer temperatures on Earth over the last 520 million years. But Mayhew and his colleagues decided to reexamine their hypothesis, this time using data that were 'a fairer sample of the history of life'. With this new collection of material, they found a complete reversal of the relationship between species richness and temperature from what their previous paper argued: The number of different groups present in the fossil record was higher, rather than lower, during 'greenhouse phases'. Their previous findings rested on an assumption that fossil records can be taken to represent biodiversity changes throughout history. This isn't necessarily the case, because there are certain periods with higher-quality fossil samples, and some that are much more difficult to sample well. Aware of this bias, Mayhew's team used data that standardized the number of fossils examined throughout history and accounted for other variables like sea level changes that might influence biodiversity in their new study to see if their old results would hold up. Two years later, the results did not. But then why doesn't life increasingly emerge on Earth as our temperatures get warmer? While the switch may prompt some to assert that climate change is not hazardous to living creatures, Mayhew explained that the timescales in his team's study are huge—over 500 million years—and therefore inappropriate for the shorter periods that we might look at as humans concerned about global warming. Many global warming concerns are focused on the next century, he said—and the lifetime of a species is typically one to 10 million years. 'I do worry that these findings will be used by the climate skeptic community to say 'Look, climate warming is fine',' he said. Not to mention the numerous other things we seem to do to create a storm of threats to biodiversity—think of what habitat (栖息地) destruction, overfishing, and pollution can do for a species' viability (生存能力). Those things, Mayhew explained, give the organisms a far greater challenge in coping with climate change than they would have had in the absence of humans. 'If we were to relax all these pressures on biodiversity and allow the world to recover over millions of years in a warmer climate, then my prediction is it would be an improvement in biodiversity,' he said. So it looks like we need to curb our reckless treatment of the planet first, if we want to eventually see a surge in the number of species on the planet as temperatures get warmer. We don't have 500 million years to wait.

单选题The two parties have ______ an agreement on the date of talk.

单选题 Shopping has always been something of an impulse activity. Advertisers and sellers have taken advantage of this fact, carefully positioning inexpensive but attractive items on paths that we are most likely to cross, in the hopes that our human nature will lead to a greater profit for them. With the dawn of the Internet and its exploding usage across the world, the same tactics apply. Advertisers now place 'banners', links to commercial web sites decorated with attractive pictures designed to catch our eyes while browsing the webs, on key web sites with heavy traffic. They pay top dollar for the right, thus creating profits for the hosting web site as well. These actions are performed in the hopes that during the course of our casual web surfing, we'll click on that banner that we are interested in and thus, in theory, buy the products advertised. Initial results have been positive. Web sites report a huge inflow of cash, both from the advertisers and the hosting web sites. As trust and confidence in Internet buying increases and information security is heightened with new technology, the volume of buying is increasing, leading to even greater profits. The current situation, however, is not quite as optimistic. Just as magazine readers tend to unconsciously ignore advertisements in their favorite periodicals (期刊), web browsers are beginning to allow banners to slip their notice as well. Internet users respond to the flood of banners by viewing them as annoyances (烦恼，令人讨厌的事), a negative image that is hurting sales, since users are now less reluctant to click on those banners, preferring not to support the system that put them in place. If Internet advertising is to continue to be a profitable business practice, new methods will need to be considered to reinvigorate (使复兴) the industry. With the recent decline in the technology sector and economy recession, even new practices may not work. As consumers are saving more and frequenting (频繁光顾) traditional 'brick and mortar' businesses over their Internet counterparts, the fate of Internet business is called into question. The coming years will be the only reliable indication of whether shopping on the world wide web is the wave of the future or simply an impulse activity.

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单选题Floods cause billions of dollars worth of property damage______.

单选题1.The manager said that there were two reasons ________ our sales dropped sharply last year.

单选题If your child has grown up, you may take the child' s things to______.

单选题— Did you come to the museum by bike yesterday? —No. Two metres of snow fell during the night. As a result, several main roads ______.

单选题The doctor did not rule out the possibility of food poisoning.

单选题_____,the issue doesn't seem to be difficult at all.

单选题 Directions: For this part, you are allowed 30 minutes to write an essay commenting on one of the most popular sentences online, 'REMEMBER... always act like you're wearing an invisible crown.' You can cite examples to illustrate your point. You should write at least 120 words but no more than 180 words.

单选题It is necessary to ______ a large vocabulary in learning a language.

单选题A traditional critic has the advantage of being able to______standards and values inherited from the past.

单选题This policy gave ______ to private property and led to differences between the rich and the poor. A. life B. birth C. way D. death

单选题Student journalists are taught how to be ______ when writing in a limited space.

单选题______ is known to the world, Lu Xun is a great Chinese writer.

单选题Any man who wants to start a business must have some ______.

单选题The writer seems to think that ______.

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