单选题Weather exports use the ______ of the barometer as one of their guides in predicting the weather.

单选题His rudeness upset her, and it took her a long time to______

单选题We brought ______ at the football match.

单选题The main point of paragraph 2 is ______.

单选题 中国经济正处在转型的关键阶段。中国已经不能继续沿用高消耗、高投入的旧模式，而必须加大力度调整经济结构和转变经济增长方式。我国将继续推进行政管理(administrative management)、金融部门和物价的改革。服务业将愈发成为我国经济中的重要支柱。作为最大的就业容纳器，服务业为经济转型缓解就业压力。中国经济的升级(upgrading)也将为世界经济提供新的动力。

单选题My sisters professor had her ______ her paper many times before allowing her to present it to the committee. A. rewritten B. to rewrite C. rewrite D. rewriting

单选题He______late into the night, but now he goes to bed early due to health reasons. 

单选题If his father could not keep up the payments on the mortgage, his uncle might ______ it for him. A. redeem B. amend C. resemble D. appeal

单选题The integration of staff for training has led to a good exchange of ideas, greater enthusiasm, and higher staff A．moral B．mortal C．morale D．mores

单选题You never told us why you were late for the party, ______?

单选题 What enables some people to get big creative breakthroughs while others only get small and non-creative breakdowns, blaming themselves and society? Are some people gifted? Are there other factors 21

单选题 It may seem ridiculous, but in the hunt for sources of alternative energy researchers have come up with fuel cells which are powered by cheese—or at least whey, a by-product in cheese making. Whey is rich in lactose, a sugar which Georgia Antonopoulou, a biochemical engineer at the University of Patras, Greece, says can be consumed by cultures of bacteria contained within a fuel cell to generate an electric current. Microbial fuel cells, as such devices are known, are not a new idea but they are attracting more attention. The organic contents of whey pose an environmental hazard and many governments now impose strict regulations requiring factories to pay for its treatment before disposal. Whey constitutes about 70% of the volume of the milk were used to make cheese. So, just one small feta facility will need to dispose of as such as 4,000 tonnes of whey in a single year, says Dr Antonopoulou. Microbial fuel cells could help, and not just in the cheese-making industry. Breweries, pig farms, food-processing plants and even sewage works could gain from the technology. Traditional fuel cells work by using a catalytic material to oxidize a fuel, such as hydrogen, and make an electric current flow between two electrodes. Microbial fuel cells function in much the same way except that the catalytic reactions are carried out by bacteria contained within the fuel-cell chamber. Under anaerobic conditions (where oxygen is absent), metabolising the fuel by feeding off it and in doing so produce natural chemical reactions that produce a current. In theory microbial fuel cells can run on almost any kind of organic matters, says Chris Melhuish, head of the Bristol Robotics Laboratory, England. 'All you have to do is match the microbial culture with the type of stuff you want to use as fuel,' he says. Dr Melhuish has been trying to power robots on domestic waste-water, but it is tricky. Ideally you would want to use cheap raw-waste products, he says. But traditionally the fuel cells work best with a refined fuel in the form of solutions containing synthetic sugars, such as glucose. However, Dr Antonopoulou has now shown that, using a culture of bacteria obtained from her local waste-water plant, it is possible to get almost as much power from raw whey as from refined fuel, provided the whey is diluted. The trouble is the power output still only amounts to milliwatts, barely enough to trickle-charge a cellphone. And working with raw waste water also presents challenges. Initially Dr Antonopoulou and her colleagues found that the coulombic efficiency of their cells-a measure of how many electrons produced actually flow into a circuit-was particularly low, at around just 2%. This turned out to be because a second set of microbes, within the whey itself, was absorbing them. So, by sterilizing the whey first to kill these other bugs they have now boosted the coulombic efficiency to around 25%.

单选题______ that my head had cleared, my brain was also beginning to work much better. A. For B. Now C. Since D. Despite

单选题The main idea of the third paragraph is that ______. ( )

单选题The spokes in a bicycle wheel are arranged in a ______ pattern.

单选题 The weather is highly ______ at this time of the year.

单选题You can arrive in Beijing earlier for the meeting ______ you don"t mind taking the night train.

单选题（）

单选题A:I have a last favor to ask of you. Could you drive my daughter to the airport? B:______