单选题Steel is an alloy composed ______of iron and carbon.

单选题John’s application for Uadmission/U to graduate studies in the School of Education has been approved.

单选题Man: Do you ever know what Tony is talking about? Woman: Never, he always beats around the bush. Question: What's the reason why the woman cannot understand Tony?

单选题The legislative {{U}}provision{{/U}} has a great impact on the operations of the department.

单选题The main purpose of the author in writing the passage is ______.

单选题Phosphorus is used in paints for highway signs and marks because it is {{U}}bright{{/U}} at night.

单选题Ethiopians appear to have evolved a unique way of coping with thin mountain air. But how they do it remains a mystery. One way for the body to get enough oxygen to its tissues when breathing oxygen-poor air is for it to make more red blood cells. This increases the amount of hemoglobin(血红蛋白), the protein that carries oxygen. Although less haemoglobin in the arteries is saturated with oxygen at high altitudes, having more of it makes up for the shortfall. People native to the high Andes are known to have more red blood cells than lowlanders, and athletes who train at altitude can increase their concentration of cells. But while many Tibetans also live at high altitudes, they do not have significantly elevated levels of haemoglobin. Instead they seem to boost the amount of nitric oxide, which dilates(使膨胀) blood vessels and increases blood flow. Now Cynthia Beall, an anthropologist from Case Western Reserve University in Cleveland, Ohio, has found a third kind of adaptation. When she tested the blood of 236 people in the Ambaras region in the Semien Mountains of Ethiopia, she found that 95 percent of the haemoglobin in their arteries is saturated with oxygen, almost as much as that of people living at low altitudes and roughly 5 per cent above that of residents in the Andes or Tibet. "That shouldn't be, "says Beall. They must have a massively efficient way to get oxygen from the lungs to the blood, she says. But just what remains mysterious. They do not have higher concentrations of haemoglobin than anyone else, nor do they have a different kind of haemoglobin. Beall adds that this ability might be found in all people living in that part of the world, and not just those in the study. It might be why so many world-class endurance athletes are Ethiopian. "The next study needs to look at that,"she says.

单选题(Not too many) years (ago) my mother jogged in the alley behind our house because she was embarrassed (to see) jogging (in public).

单选题A: How annoying! I can't come up with an answer to that problem. Can you give me a hand?B: ______

单选题{{B}}Passage Three{{/B}} 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Scientists have been eager to ______ for research funds without thinking over the impact of the research.

单选题If one does not pick up (his) dry-cleaning (within) thirty days, the management is not (obligated) to return it (back).

单选题The Prime Minister explained the new policy of his government in great detail so as to win the support of his people.

单选题In Thailand four banks went bankrupt, which led to a ______ among businessmen.

单选题If you Ubecome reconciled/U to your lot, you will never dig out your potential and will remain what you are.

单选题The bat is a marvel of evolutionary adaptation. Most of them roost during the day, and are active at night or twilight for they can avoid objects in the dark. I have seen this phenomenon at work. In my youth, I used to explore old mining shafts in the Randsburg district. Sometimes my intrusion disturbed clans of bats that were hanging upside down in the dark caves. They would fly about to evident panic, but the panic was mine, not theirs. Some flew crazily out into the daylight but some merely returned to their perches. None ever touched me, much to my relief. They may exist but I have never seen a stuffed nylon bat. To children, bats may not be as lovable as koala bears. Perhaps manufacturers do not regard them as marketable. It is not so much their hideous faces and winged bodies that have caused us to get rid of bats, but rather the ancient myths in which dead humans, such as Count Dracula, leave their graves at night in the form of bats to suck blood from human victims, especially fragile young woman. As we know from some movies these vampires must return to their graves before daylight. Endangered young women can frustrate vampire by sleeping with a string of garlic around their necks. There are actually three species of bloodsucking bats. They are called vampire bats after the ancient legends, and their tactics are indeed frightful. Like Count Dracula, they feed at night. They make a small cut in their sleeping victim with sharp incisor teeth, usually not even awakening their prey. Then they suck the blood that sustains them. Should that discourage children from wanting them as pets? As Mitchell notes from the New Yorker ad, bats are clean and intelligent. Most of them are insect-eaters, and they serve nature by destroying crop-damaging insects. They also pollinate (传授花粉) flowers and spreading seed. Bat Conservation International claims that without bats a host of insects/pests would multiply unchecked and many of our planet's most valuable plants would go unpollinated. It is clear that the bar is our friend, and that, despite its appearance, it is here to serve humanity. I'd be the first to buy a stuffed nylon bat. Children's hearts are big, and bats need love, too.

单选题Woman: What do you think of Dr. White's chemistry class?Man: Now there's a teacher who knows her subject!Question: What does the man mean?

单选题Why is Valentine's Day, a holiday dedicated to the sweet bloom of love, celebrated in a cold month more suited to hats and gloves than to thoughts of love? "It's very mysterious," says Henry Kelly, director of the Center for Medieval and Renaissance Studies at the University of California. Kelly theorizes lovers everywhere can thank two guys from the 14th century: renowned poet Geoffrey Chaucer—famous for penning "The Canterbury Tales"—and a not-so-famous saint who went by the name of Valentine. In 1381, Chaucer was busy composing a poem in honor of the arranged marriage between England's Richard II and Anne of Bohemia. Chaucer was looking for just the right saint to honor on May 3, the day Richard II signed the papers of engagement to his Bohemia beauty. His search ended, Kelly guesses, when Chaucer learned that a Saint Valentine of Genoa had an honorary feast day on May 3. So he wrote the poem "The Parliament of Fowls" in the couple's honor. "The Parliament of Fowls" literally means "the meeting of birds" , says Kelly. "Chaucer dreamed up the idea that all birds chose their mates on May 3rd. When the spring brought its sunny smile back to the earth, it was easy to imagine the winged animals fluttering about and flirting with their lovers. " After Chaucer's death in ld00, Valentine's Day celebrations got pushed back to February. The date may have changed because the first song birds that traditionally warble(鸟鸣) after a winter tend to debut in mid-February. But the holiday that honors lovebirds everywhere with rhymed verse and colored candy hearts has not always been so popular. The very celebration of Valentine's Day has gone in and out of vogue. In the 16th century in Genoa you have it, but there is not much notice of it in other countries. The sweet-toothed holiday experienced renewed vigor in England just prior to 1800, and publishing companies came to the aid of tongue-tied lovers by distributing booklets of passages lovers could use to stir hearts. If they couldn't find the words in their hearts, companies figured, at least these Romeos could find some coins in their pocket to make their sweethearts happy. The celebration suffered a popularity plunge in the 19th century, but by the next century, Americans had rescued Valentine's Day from the trash heap, turning it into a commercial bonanza.

单选题{{B}}Passage Five{{/B}} Tattoos didn't spring up with the biker gangs and rock 'n' roll bands. They've been around for a long time and had many different meanings over the course of history. For years, scientists believed that Egyptians and Nubians were the first people to tattoo their bodies. Then, in 1991, a mummy was discovered, dating back to the Bronze Age of about 3,300 B.C. "The Iceman," as the specimen was called, had several markings on his body, including a cross on the inside of his knee and lines on his ankle and back. It is believed these tattoos were made in a curative (治病的) effort. Being so advanced, the Egyptians reportedly spread the practice of tattooing throughout the world. The pyramid-building third and fourth dynasties of Egypt developed international nations with Crete, Greece', Persia and Arabia. The art tattooing stretched out all the way to Southeast Asia by 2,000 B.C. Around the same time, the Japanese became interested in the art but only for its decorative attributes, as opposed to magical ones. The Japanese tattoo artists were the undisputed masters. Their use of colors, perspective, and imaginative designs gave the practice a whole new angle. During the first millennium A.D., Japan adopted Chinese culture in many aspects and confined tattooing to branding wrongdoers. In the Balkans, the Thracians had a different use for the craft. Aristocrats, according to Herodotus, used it to show the world their social status. Although early Europeans dabbled with tattooing, they truly rediscovered the art form when the world exploration of the post-Renaissance made them seek out new cultures. It was their meeting with Polynesian that introduced them to tattooing. The word, in fact is derived from the Polynesian word tattau, which means "to mark." Most of the early uses of tattoos were ornamental. However, a number of civilizations had practical applications for this craft. The Goths, a tribe of Germanic barbarians famous for pillaging Roman settlements, used tattoos to mark their slaves. Romans did the same with slaves and criminals. In Tahiti, tattoos were a rite of passage and told the history of the person's life. Reaching adulthood, boys got one tattoo to commemorate the event. Men were marked with another style when they got married. Later, tattoos became the souvenir of choice for globe-trotting sailors. Whenever they would reach an exotic locale, they would get a new tattoo to mark the occasion. A dragon was a famous style that meant the sailor had reached a "China station." At first, sailors would spend their free time on the ship tattooing themselves and their mates. Soon after, tattoo parlors were set up in the area, surrounding ports worldwide. In the middle of the 19th century, police officials believed that half of the criminal underworld in New York City had tattoos. Port areas were renowned for being rough places flail of sailors that were guilty of some crime or another. This is most likely how tattoos got such a bad reputation and became associated with rebels and criminals.