单选题The teacher said she liked my composition, and then Uproceeded/U to criticize every line of it!

单选题The fuel tanks had a capacity of 140 liters.

单选题Older Volcanic Eruptions Volcanoes were more destructive in ancient history, not because they were bigger, but because the carbon dioxide they released wiped out life with greater ease. Paul Wignall from the University of Leeds was investigating the link between volcanic eruptions and mass extinctions. Not all volcanic eruptions killed off large numbers of animals, but all the mass extinctions over the past 300 million years coincided with huge formations of volcanic rock. To his surprise, the older the massive volcanic eruptions were, the more damage they seemed to do. He calculated the "killing efficiency" for these volcanoes by comparing the proportion of life they killed off with the volume of lava (熔岩) that they produced. He found that size for size, older eruptions were at least 10 times as effective at wiping out life as their more recent rivals. The Permian (二叠纪) extinction, for example, which happened 250 million years ago, is marked by floods of volcanic rock in Siberia that cover an area roughly the size of western Europe. Those volcanoes are thought to have pumped out about 10 gigatonnes (十亿吨) of carbon as carbon dioxide. The global warming that followed wiped out 80 percent of all marine genera (种类) at the time, and it took 5 million years for the planet to recover. Yet 60 million years ago, there was another huge amount of volcanic activity and global warming but no mass extinction. Some animals did disappear but things returned to normal within ten thousands of years. "The most recent ones hardly have an effect at all." Wignall says. He ignored the extinction which wiped out the dinosaurs 65 million years ago, because many scientists believe it was primarily caused by the impact of an asteroid (小行星). He thinks that older volcanoes had more killing power because more recent life forms were better adapted to dealing with increased levels of CO 2 . Vincent Courtillot, director of the Paris Geophysical Institute in France, says that Wignall"s idea is provocative. But he says it is incredibly hard to do these sorts of calculations. He points out that the killing power of volcanic eruptions depends on how long they lasted. And it is impossible to tell whether the huge blasts lasted for thousands or millions of years. He also adds that it is difficult to estimate how much lava prehistoric volcanoes produced, and that lava volume may not necessarily correspond to carbon dioxide emissions.

单选题Eleanor Roosevelt urged legislation to assist the poor and oppressed.

单选题The manager allocate duties to the clerks.

单选题Louis was asked to name the man who stole her purse. A. confirm B. recognize C. claim D. identify

单选题Many scientists have been probing psychological problems.

单选题The weather was nice in Trumbull County on Saturday evening.

单选题The weather is a constant subject of conversation in Britain.

单选题Knowing that I had been out of work now, they were unwilling to lend me money.

单选题Mary just told us a very {{U}}fascinating{{/U}} story. A. strange B. frightening C. difficult D. interesting

单选题Paper or Plastic? Take a walk along the Chesapeake Bay, and you are likely to see plastic bags floating in the water. Ever since these now ubiquitous symbols of American super-consumption showed up in the supermarkets, plastic shopping bags have made their 1 into local waterways, and from there, into the bay, where they can 2 wildlife. Piles of them—the 3 takes centuries to decompose—show up in landfills and on city streets. Plastic bags also take an environmental toll in the form of millions of barrels of oil expended every year to produce them. Enter Annapolis 4 you will see plastic bags distributed free in department stores and supermarkets. Alderman Sam Shropshire has introduced a well-meaning proposal to ban retailers 5 distributing plastic shopping bags in Maryland"s capital. Instead, retailers would be required to offer bags 6 recycled paper and to sell reusable bags. The city of Baltimore is considering a similar measure. Opponents of the idea, however, argue that 7 bags are harmful, too: they cost more to make, they consume more 8 to transport, and recycling them causes more pollution than recycling plastic. The argument for depriving Annapolis residents of their plastic bags is 9 accepted. Everyone in this 10 is right about one thing: disposable shopping bags of any type are 11 , and the best outcome would be for customers to reuse bags instead. Annapolis"s mayor is investigating how to hand out free, reusable shopping bags to city residents, a proposal that can proceed regardless of whether other bags are banned. A less-expensive 12 would be to encourage retailers to give discounts to customers 13 bring their own reusable bags, a policy that a spokesman for the supermarket Giant Food says its chain already has in place. And this policy would be more 14 if stores imitated furniture mega-retailer Ikea and charged for disposable bags at the checkout counter. A broad ban on the use of plastic shopping bags, which would merely replace some forms of pollution with others, is not the 15 .

单选题Ants always put food away in Autumn. A. store B. steal C. eat D. carry

单选题We must abide by the rules.

单选题The little boy was so fascinated by the {{U}}mighty{{/U}} river that he would spend hours sitting on its bank and gazing at the passing boats and rafts.

单选题Which of the following is NOT mentioned as an example involving nonverbal thinking in paragraphs 1 and 2?

单选题Our English teacher is sick.A. fatB. weakC. illD. mad

单选题We are going to have the TV fixed .

单选题Improve Computer-research Skills Like many college students, Jose Juarez carries around a pocket-sized computer that lets him watch movies, surf the Internet and text-message his friends. He"s part of "Generation M" —those born after 1985 who 1 up connected to everything from video games to cellphones. "For us, it"s everyday life," said Juarez, 18, a freshman 2 California State University at Sacramento (CSUS). 3 , educators are now saying that not all Generation M-ers can synthesize the piles of information they"re accessing. "They"re geeky (与网络交往的), but they don"t know what to 4 with their geekdom," said Barbara O"Connor, a communications studies professor who has been involved in a nationwide 5 to improve students" computer-research skills. In a recent nationwide test to 6 their technological "literacy" —their ability to use the Internet to complete class assignments—only 49 percent correctly evaluated a set of Web sites for objectivity, authority and timeliness. Only 35 per cent could correctly narrow an overly 7 Internet search. About 130 Sacramento State students, including Juarez, participated in the experimental test, 8 to 6,300 college students across the country. The hour-long assessment test is conducted by Educational Testing Service. It is a web-based scavenger (食肉动物) hunt 9 simulated Internet search engines and academic databases that spit out purposely misleading information. "They"re very good at 10 in and using the Internet, but don"t always understand what they get back," said Linda Goff, head of instructional services for the CSUS library. "You see an open search box, you type in a few words and you 11 the button," said Golf, who is involved in the testing. "They take at face value 12 shows up at the top of the list as the best stuff." Educators say that these sloppy (马虎) research skills are troubling. "We look at that as a foundational skill, in the same way we 13 math and English as a foundational skill," said Lorie Roth, assistant vice-chancellor for academic programs in the CSU system. Measuring how well students can "sort the good 14 the bad" on the Internet has become a higher priority for CSU, Roth said. CSU is considering 15 a mandatory (强制性的) assessment test on technological literacy for all freshmen, much as it has required English and math placement tests since the 1980"s.

单选题We"ve seen a marked shift in our approach to the social issues.