单选题Acid rain leads to fish mortality. Many species of fish cannot survive in aquatic environments where the pH is below 5.0. If the water is too acid, the gill systems of many kinds of fish can be damaged. (61) , the acid alters the blood chemistry of all fish. As a result, the fish population in an acidic environment decreases (62) becomes extinct. Approximately 20 percent of the lakes in Scandinavia are without fish. Moreover, in Nova Scotia the (63) salmon industry may be threatened by the decrease of salmon in rivers and streams. The impact is also (64) in the waters of Ontario and Quebec, where fish populations are (65) the decline. What potential remedies exist for the acid rain (66) ? The experts disagree. Some say new environmental laws should be (67) to control the emission of pollutants in the atmosphere. Some say that if we had known how serious acid rain was, we would have planned (68) to prevent it. (69) , all agree that if the consumption of fossil fuel were reduced, we would have less of a problem. Another (70) is that special scrubbers could be installed in smokestacks to remove a good (71) of the pollutants before they get into the atmosphere. Other ideas even include breeding more (72) fish. And research suggests that spreading lime into lakes may be effective in (73) acidity. In conclusion, it is clear that if we truly want to reduce the impact of acid rain, a (74) of remedies and international cooperation must be explored. It is a sad fact that acid rain probably could have been avoided if we (75) what we know now.

单选题Text Two Phrases: A. introduce you to our 62 facilities B. check out 63 five books C. houses our humanities and map 64 Welcome to the university library. This tour will 65 . First of all, the library’s collection of books, reference materials, and other resources are found on levels one to four of this building. Level one 66 . On level two, you will find our circulation desk, current periodicals and journals, and our copy facilities. Our science and engineering sections can be found on level three. Finally, group study rooms and the multimedia center are located on level four. Undergraduate students can 67 for two weeks. Graduate students can check out fifteen books for two months. Books can be renewed up to two times.

单选题The National Education Association claims. "The school bus is a mirror of the community." They further add that, unfortunately, what appears on the exterior does not always reflect the reality of a chosen community. They are right--sometimes it reflects more! Just ask Liesl Denson. Riding the school bus has been more than a ride to school for Liesl. Bruce Hardy, school bus driver for Althouse BUS Company, has been Liesl's bus driver since kindergarten. Last year when Liesl's family moved to Parkesburg, knowing her bus went by her new residence, she requested to ride the same bus. This year Liesl is a senior and will enjoy her last year, riding the bus. She says, "It's been a great ride so far ! My bus driver is so cool and has always been a good friend and a good listener. Sometimes when you're a child adults do not think that what you have to say is important. Mr. Hardy always listens to what you have to say and makes you feel important." Her friends Ashley Batista and Amanda Wolfe agree. Bruce Hardy has been making Octorara students feel special since 1975. This year he will celebrate 30 years working for Althouse Bus Company, Larry Althouso, president of the company, acknowledges Bruce Hardy's outstanding record . "You do not come by employees like Bruce these days. He has never missed a day of work and has a perfect driving record. He was recognized in 2000 by the Pennsylvania School Bus Association for driving 350 000 accident free miles. Hardy's reputation is made further evident through the relationships he has made with the students that ride his bus." Althouse further adds, "Althouse Bus Company was established 70 years ago and has been providing quality transportation ever since. My grandfather started the business with one bus. Althouse Bus Company is delighted to have the opportunity to bring distinctive and safe service to our local school and community and looks forward to continuing to provide quality service for many more years to come." Three generations of business is not all the company has enjoyed. Thanks to drivers like Bruce Hardy, they have been building relationships through generations, Liesl's mother Carol also enjoys fond memories of riding Bruce Hardy's bus to the Octorara School District.

单选题A: That'll be $6.75.B: ______

单选题Gazing at others" eyes generally signals a request for information and perhaps affection, but embarrassment can result from too long a mutual gaze.

单选题If hotel officials saw Paul was intoxicated, as some employees reportedly said last week, why did they let him drive?

单选题The defense lawyer was questioning the old man who was one of the ______ of the murder committed last month.

单选题The wandering ship was a dramatic symbol for a problem plaguing our age. In 1987, the ship, loaded with thousands of tons of New York garbage, spent weeks wandering from one port to another in search of a dump before finally returning home, mission unaccomplished. New York, like other communities throughout the world is running out of space to put its trash. As throwaway societies, the US and other industrialized countries expect their garbage to be picked up by trucks that magically transported the refuse to some out-of-sight incinerator(焚化炉) or dump. But in the developing counties of Asia, Africa and Latin America, thousands of tons of trash collected daily are thrown into open dumps, where it feeds huge populations of rats that swarm through poor neighborhoods. "The world is literally swimming in garbage," says a scientist, "Communities worldwide are being forced to confront the problem." Green Peace spokesman Bryan Bence adds, "The crisis in garbage stems in part from the fact that we've ignored long-term disposal problem in favor of cheap quick fixes." The garbage glut (过选剩) has inspired many communities in the U.S., Japan and Western Europe to start recycling programs. Once considered a curious counter culture activity recycling has moved firmly into the mainstream. Recycling involves separating usable products from trash, processing them so they can be substituted for more expensive raw materials and returning them to the marketplace as parts of new products. Many countries now have mandatory recycling programs, and others plan to follow the trend soon. Most notably, Japan has stood out as a model and leader of the waste management trend, recycling an estimated 65 percent of its waste. "That's what we should do, to the garbage crisis", says David Antonioli, a staff member with the New York Public Interest Research Corp. "The earth is not a dump!/

单选题The ______of a sales tax is that it decreases government reliance on income taxes.

单选题Tom is reliable, so you can count on him.

单选题Finding out about these universities has become easy for anyone with Internet ______

单选题Man: We're looking for a place to hold a surprise party for Jill. There's a lot of space in your apartment, isn't there?Woman: There used to be. You see, well, I just can't bring myself to throw anything away.Question: What does the woman imply?

单选题What is the author's tone about eating chocolates?

单选题We want you to describe all the events of that morning in sequence without any delay.

单选题The destruction 'an earthquake causes depends on its ________ and duration, or the amount of shaking that occurs.

单选题Like some foreigners, I ask a lot of questions, some of which are insultingly silly. But everyone I ______ has answered those questions with patience and honesty.

单选题A report published recently brings bad news about air pollution. It suggests that it could be as damaging to our health as exposure to the radiation from the 1986 Ukraine nuclear power disaster. The report was published by the UK Royal Commission on Environmental Pollution. But what can city people do to reduce exposure to air pollution? Quite a lot, it turns out. Avoid walking in busy streets. Choose side streets and parks instead. Pollution levels can fall a considerable amount just by moving a few meters away from the main pollution source—exhaust fumes (烟气). Also don't walk behind smokers. Walk on the windward side of the street where exposure to pollutants can be 50 percent less than on the downwind side. Sitting on the driver's side of a bus can increase your exposure by 10 percent, compared with sitting on the side nearest the pavement. Sitting upstairs on a double-decker can reduce exposure. It is difficult to say whether traveling on an underground train is better or worse than taking the bus. Air pollution on underground trains tends to be less toxic than that at street level, because underground pollution is mostly made up of tiny iron particles thrown up by wheels hitting the rails. But diesel and petrol fumes have a mixture of pollutants. When you are crossing a road, stand well back from the curb while you wait for the light to change. Every meter really does count when you are close to traffic. As the traffic begins to move, fumes can be reduced in just a few seconds. So holding your breath for just a moment can make a difference, even though it might sound silly. There are large sudden pollution increases during rush hours. Pollution levels fall during nighttime. The time of year also makes a big difference. Pollution levels tend to be at their lowest during spring and autumn when winds are freshest. Extreme cold or hot weather has a trapping effect and tends to cause a build-up of pollutants.

单选题Only when (he realized) that there (would be) more (difficulties) ahead than he expected (he came to) me for help.

单选题Lyndon B. Johnson (was) the only United States President (who) oath of (office) as (administered) by a woman Judge called Sarah Tilghman Hughes.A. wasB. whoC. officeD. administered