单选题The Galapagos Islands are in the Pacific Ocean, off the western coast of South America. They are a rocky, lonely spot, but they are also one of the most unusual places in the world. One reason is that they are the home of some of the last giant tortoises left on earth. Weighing hundreds of pounds, these tortoises, or land turtles, wander slowly around the rocks and sand of the islands. Strangely, each of these islands has its own particular kinds of tortoises. There are seven different kinds of tortoises on the eight islands, each kind being slightly different from the other. Hundreds of years ago, thousands of tortoises wandered around these islands. However, all that changed when people started landing there. When people first arrived in 1535, their ships had no refrigerators. This meant that fresh food was always a problem for the sailors on board. The giant tortoises provided a solution to this problem. Ships would anchor off the islands, and crews would row ashore and seize as many tortoises as they could. Once the animals were aboard the ship, the sailors would roll the tortoises onto their backs. The tortoises were completely helpless once on their backs, so they could only lie there until used for soups and stews. Almost 100, 000 tortoises were carried off in this way. The tortoises faced other problems, too. Soon after the first ships, settlers arrived bringing pigs, goats, donkeys, dogs and cats. All of these animals ruined life for the tortoises. Donkey and goats ate all the plants that the tortoises usually fed on, while the pigs. Dogs and cats consumed thousands of baby tortoises each year. Within a few years, it was hard to find any tortoise eggs-or even any baby tortoises. By the early 1900s, people began to worry that the last of the tortoises would soon die out. No one, however, seemed to care enough to do anything about the problem. More and more tortoises disappeared, even though sailors no longer needed them for food. For another fifty years, this situation continued. Finally, in the 1950s, scientist decided that something must be done. The first part of their plan was to get rid of as many cats, dogs and other animals as they could. Next, they tried to make sure that more baby tortoises would be born. To do this, they started looking for wild tortoise eggs. They gathered the eggs and put them in safe containers. When the eggs hatched, the scientists raised the tortoises in special pens. Both the eggs and tortoises were numbered so that the scientists knew exactly which kinds of tortoises they had—and which island they came from. Once the tortoises were old enough and big enough to take care of themselves, the scientists took them back to their islands and set them loose. This slow, hard work continues today, and, thanks to it, the number of tortoises is now increasing every year. Perhaps these wonderful animals will not disappear after all.

单选题Finally this theory is widely understood and accepted the world over, i. e. it has a ______; and is therefore a good basis for discussion of an ethical problem.

单选题I think that I committed a______in asking her because she seemed very upset by my question.(2011年四川大学考博试题)

单选题Measuring skin fold thickness is considered to be an ______ method for estimating the amount of fat on one's body. A. accessible B. accountable C. acceptable D. adaptable

单选题It is now common for physically disabled individuals to receive the bulk of their education in regular school programs.

单选题I had______to come to see you, but I suddenly fell ill.

单选题Among the many open research questions on MTBE are how it is metabolized, ______the levels of exposure in the general population are.

单选题If you want to buy this house, the payment may be made in five______.

单选题The significance of the cultural reconstruction of old age mainly lies in______.

单选题I was most favorably struck by the assurance with which the boy answered all my questions.(2004年秋季电子科技大学考博试题)

单选题U.S. airlines could slash 70,000 more jobs if there were war with Iraq and the U.S. government did not give the industry, more help, the biggest domestic carriers said on Tuesday. The Air Transport Association, which represents major airlines, said in a report on airline finances that its members would take aggressive steps to counter any sharp drop in travel demand and an increase in costs caused by an Iraqi war. Big airlines are seeking government assistance to stem rising fuel costs and ease taxes that are contributing to losses that soared to more than $10 billion in 2002. The industry outlined a "most likely" scenario if war broke out, saying that reduced demand and higher costs due to a conflict lasting 90 days would cost it $4 billion in lost revenue. Without a conflict, losses would still be expected to reach almost $7 billion for the year. "The nation's air carders will continue to do all we can, but we fear that the consequences of this war will be severe," James May, president and chief executive of the air transport group, told a news conference. May restated the industry's belief that war could prompt more bankruptcies or force some financially fragile carders into liquidation. Recovery would take several years and ticket prices would have to fall further to spur demand. US Airways Group Inc. and UAL Corp's United Airlines are in Chapter 11 bankruptcy protection, and some industry experts believe that AMR Corp's American Airlines, the world's biggest carrier could follow later this year. Airlines expect overall traffic volume during a second Gulf conflict would fall more sharply than it did during the 1991 war, when it declined 8 percent after fighting began. The airlines based their assessment on a slide of more than 20 percent in advance bookings for overseas travel after the U. S. government elevated its domestic terror alert status from yellow to orange in early February. Jet fuel has more than doubled in price from a year ago to, $1.30 a gallon recently. Fuel is the second-largest expense after labor for an airline. An increase of one penny a gallon costs the industry an estimated $180 million annually.

单选题Before the first World War, female secretaries were rare because they ______.

单选题A plow is a farm ______ used to break the soil before seeds are planted.

单选题The car pollutes, but advances in fuel quality and efficiency, and in microprocessed engine technology, have radically cut ______. A. releases B. emissions C. poisons D. contamination

单选题The author considers our understanding of dreaming someday ______.

单选题Despite the end of the Cold War, defense and civil industrial interests in "small" science are______.

单选题 National Parks have more and more visitors each year. In the last ten years the number of campers using the camp sites has more than doubled. Camping as a family vacation has suddenly become extremely popular in America. It is a cheap way to travel; its simple pleasures are a pleasant change from hectic urban life; and it can be enjoyed by children of all ages. In car trunks or in racks on top of cars, families load a tent, sleeping bags, inflatable mattresses, cooking pans and eating utensils, and an ice chest for storing food. When they arrive at a camping ground they find a cleared space in which to pitch their tent, a fireplace for cooking, and usually a picnic table and benches--water and firewood nearby. By evening they are settled under the stars, the campsite around them dotted with lights from cooking fires and lanterns hung from trees. Vacations are not all in resorts or in the wilderness. Swarms of vacationing Americans visit New York and Washington each year. They visit New York because there is no place in the world like this tremendous, exciting city, the busiest port in the world, with its great steel and glass skyscrapers, its theaters and shops, its beauty of skyline and shoreline, and its thrilling five-cent ferry ride past the Statue of Liberty. They visit Washington because it is the nation's capital, where they can see their government at work, tour the public rooms of their President's home, the White House, and walk along the wide avenues to the art galleries and museums. Here they can see exhibits of the native peoples of their land--the Indians and the Eskimos. They can look at Lindbergh's small, fragile plane in which he crossed the Atlantic Ocean. They can ride the elevator to the top of the Washington Monument, visit Washington's Mount Vernon home, and feel the shiver of national pride as they stand at the foot of the great Lincoln Monument and read the stirring words of his Gettysburg Address. For Americans vacation time ends on Labor Day--the first Monday in September. Labor Day is the day when summer cottages are closed, when families head back to their homes. The highways are jammed with cars. The cars are jammed with families and belongings and treasures of the summer. By the time the drivers are back home they sometimes feel that what they need is a vacation.

单选题Maximum benefits typically range from $50,000 to $250,000 though some______have no limit.