单选题 Many theories concerning the causes of juvenile delinquency (青少年犯罪) focus either on the individual or on society as the major contributing influence. Theories{{U}} (56) {{/U}}on the individual suggest that children engage in criminal behavior{{U}} (57) {{/U}}they were not sufficiently penalized for previous misdeeds or that they have learned criminal behavior through{{U}} (58) {{/U}}with others. Theories focusing on the role of society suggest that children commit crimes in response to their failure to rise above their socioeconomic status{{U}} (59) {{/U}}as a rejection of middle-class values. Most theories of juvenile delinquency have focused on children from disadvantaged families, {{U}}(60) {{/U}}the fact that children from wealthy homes also commit crimes. The latter may commit crimes for lack of adequate parental control. All theories, however, are tentative and are{{U}} (61) {{/U}}to criticism. Changes in the social structure may indirectly{{U}} (62) {{/U}}juvenile crime rates. Families have also{{U}} (63) {{/U}}changes these years. More families consist of one parent households or two working parents;{{U}} (64) {{/U}}, children are likely to have less supervision at home,{{U}} (65) {{/U}}was common in the traditional family{{U}} (66) {{/U}}. This lack of parental supervision is thought to be an influence on juvenile crime rates. Other{{U}} (67) {{/U}}causes of offensive acts include frustration or failure in school, the increased{{U}} (68) {{/U}}of drugs and alcohol, and the growing{{U}} (69) {{/U}}of child abuse and child neglect. All these conditions tend to increase the probability of a child committing a criminal act,{{U}} (70) {{/U}}a direct causal relationship (因果关系) has not yet been established.

单选题Why should I be against measures attempting to eradicate the problem altogether?

单选题Meteorologists are {{U}}at odds{{/U}} over the workings of tornadoes.

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.