单选题In the last paragraph, the word" one" could best be replaced by ______.

单选题What is the passage mainly about?

单选题What happened to Miss Gray?

单选题 {{I}}Questions 11 to 14 are based on the passage you have just heard.{{/I}}

单选题The first man who cooked his food, instead of eating it raw, lived so long ago that we have no idea who he was or where he lived. We do know, however, that (1) thousands of years, food was always eaten cold and (2) . Perhaps the first cooked food was heated accidentally by a (3) fire or by the molten lava form an erupting (4) . No doubt, when people first tasted food that had been cooked, they found it tasted better. However, (5) after this discovery, cooked food must have remained a rarity (6) man learned how to make and control fire (7) . Primitive men who lived in hot regions could depend on the heat of the sun (8) their food. For example, in the desert (9) of the southwestern United States, the Indians cooked their food by (10) it on a flat (11) in the hot sun. They cooked pieces of meat and thin cakes of corn meal in this (12) . We can surmise that the earliest kitchen (13) was a stick (14) which a piece of meat could be attached and held over a fire. Later this stick was (15) by an iron rod which could be turned frequently to cook the meat (16) all sides. Cooking food in water was (17) before man learned to make water containers that could not be (18) by fire. The (19) cooking pots were reed or grass baskets in which soups and stews could be cooked. As early as 166 BC, the Egyptians had learned to make (20) permanent cooking pots out of sandstone. Many years later, the Eskimos learned to make similar pans.

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单选题Whatarethetwospeakerstalkingabout?

单选题Since he was a child, Don Cameron has been interested in anything that flies. He grew up on the outskirts of Glasgow and, as a student at Glasgow University, joined the University Air Squadron. Interest in the mechanics of movement, if not flight, was a family tradition. His grandfather was an engineer, who turned his hand to making model steam engines and boats. Don Cameron"s first job was at Bristol Aircraft, where he worked as an engineer. He then had jobs in the steel works at Lanwern and for Rio-Tinto Zine in Bristol, working with computers. In the mid-sixties came news of American experiments with hot air balloons that crossed the Atlantic, so he and a couple of friends decided to build their own balloon. Probably the first hot air balloon in western Europe, they called it the Bristol Belle. Now there are 300 balloons in this country alone—and at least two-thirds of them have been made by the firm Don Cameron set up, Cameron Balloons. At 40 he has already been halfway round the world by balloons. In 1972 he piloted the first hot air balloon to cross the Swiss Alps; and later that year he took part in what he calls "an odd expedition" to the Sahara Desert, with two balloons and a truck to carry the gas. He has crossed the Channel by balloon and even flown in the Arctic Circle in one. He started the business in the basement of the large Victorian house, where he lives with his wife Kim and two children. Now Cameron Balloons has its own premises in an old church hall in Bristol, making about 150 balloons a year. They include specially designed balloons for advertising purposes. The firm exports all over the world and is setting up a factory in America, where balloons will be made for them under license. The turnover is now around $ 500 000 a year and there is a staff of about 25.

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单选题Text (9) a vacation spot that (10) the excitement of a bustling city with the (11) of an island paradise? Then consider Auckland, New Zealand. About 11 hours from Southeast Asia, this city is sandwiched (12) two harbors on New Zealand' s North Island. Auckland is becoming more famous all over the world for its (13) quality of life. And if you don' t have a lot of (14) time, don' t worry. You can (15) much of this city in just two days. Start your first day in downtown Auckland. Go to Queen Street and try (16) the Sky Tower. (17) 328 meters, it' s the tallest structure in (18) Southern Hemisphere. Inside the tower, you' ll find a hotel, casino, theater and many restaurants. The tower' s newest (19) is a guided climb up a unique ladder system through the middle of the tower. (20) guides take you up to the top for a stunning (21) of Auckland. Once on the ground again, (22) your way to Victoria Park Market. It' s just a few minutes' walk (23) the tower. Victoria Park Market was (24) built in 1905 as an industrial site. But the area was (25) in 1981 into an (26) -air shopping mall. All the clothes and (27) you' ll find here are made locally. So take your time (28) through this special market. …

单选题Scientists are learning more about our need for sleep. Most people sleep (26) eight hours each night. (27) people sleep more than (28) and others sleep as (29) as two or three hours each night. Scientists do not know exactly (30) some people sleep more than others. Dr. Ernest Hartman has a (an) (31) about this. He believes that the (32) of sleep depends on how a person (33) problems. He said people who need only a few (34) sleep usually are people who have much energy and make good use of (35) to get their work to be done quickly. (36) he said many people who sleep longer than normal do creative work and seem to need (37) dreaming time to find solution (38) emotional problems. Some scientists agree (39) this idea and others dispute. To determine the (40) of the lack of sleep, scientists have put (41) through a set of psychological and performance tests (42) them, for instance, to add columns of numbers or recite a passage read to them only minutes earlier, "We've found that if you're in sleep (43) , performance suffers," says Dr. David. "Short-term memory is (44) , (45) are abilities to make decisions and to concentrate./

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单选题Socrates was condemned to death because he______.

单选题Adam Smith mentioned the number 4, 800 in order to______.