单选题I am always conscious of my own shortcomings.

单选题It is laid down in the regulations that all members must carry their membership cards at all times.

单选题下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。 Cell Phone Lets Your Secret Out Your cell phone holds secrets about you. Besides the names and {{U}}(51) {{/U}} that you've programmed into it, traces of your DNA linger(逗留) on the device, according to a new study. DNA is genetic(遗传的) material that {{U}}(52) {{/U}} in every cell. Like your fingerprint, your DNA is unique to you {{U}}(53) {{/U}} you have an identical twin. Scientists today routinely analyze DNA in blood, saliva(涎，唾液), or hair left {{U}}(54) {{/U}} at the scene of a crime. The results often help detectives identify {{U}}(55) {{/U}} and their victims. Your cell phone can reveal more about you {{U}}(56) {{/U}} you might think. Meghan J. McFadden, a scientist at McMaster University in Hamilton, Ontario, heard about a crime in which the suspect bled onto a cell phone and later dropped the {{U}}(57) {{/U}} This made her wonder whether traces of DNA lingered on cell phones -- even when no blood was involved. {{U}}(58) {{/U}} she and colleague Margaret Wallace of the City University of New York analyzed the flip-open phones(翻盖手机) of 10 volunteers. They used swabs(药签) to collect {{U}}(59) {{/U}} traces of the users from two parts of the phone: the outside, where the user holds it, and the {{U}}(60) {{/U}}, which is placed at the user's ear. The scientists scrubbed(用力擦洗；擦净) the phones using a solution made mostly {{U}}(61) {{/U}} alcohol. The aim of washing was to remove all detectable traces of DNA. The owners got their phones {{U}} (62) {{/U}} for another week. Then the researchers collected the phones and repeated the swabbing of each phone once more. The scientists discovered DNA that {{U}}(63) {{/U}} to the phone's speaker on each of the phones. Better samples were collected from the outside of each phone, but those swabs also picked up DNA that belonged to other people who had apparently also handled the phone. {{U}}(64) {{/U}}, DNA showed up even in swabs that were taken immediately after the phones were scrubbed. That suggests that washing won't remove all traces of evidence from a criminal's device. So cell phones can now be added to the {{U}}(65) {{/U}} of clues that can clinch(确定，决定) a crime-scene investigation.

单选题The priest failed to build the boat because

单选题 Being thin or not No woman can be too rich or too thin. This saying often attributed to the late Duchess of Windsor embodies much of the odd spirit of our times. Being thin is deemed as such a virtue. The problem with such a view is that some people actually attempt to live by it. I myself have fantasies of slipping into narrow designer clothes. Consequently, I have been on a diet for the better-or worse-part of my life. Being rich wouldn't be bad either, but that won't happen unless an unknown relative dies suddenly in some distant land, leaving me millions of dollars. Where did we go off the track? When did eating butter become a sin, and a tittle bit of extra flesh unappealing, if not repellent? All religions have certain days when people refrain from eating, and excessive eating is one of Christianity's seven deadly sins. However, until quite recently, most people had a problem getting enough to eat. In some religious groups, wealth was a symbol of probable salvation and high morals, and fatness a sign of wealth and well-being. Today the opposite is true. We have shifted to thinness as our new mark of virtue. The result is that being fat-or even only somewhat overweight-is bad because it implies a lack of moral strength. Our obsession with thinness is also fueled by health concerns. It is true that in this country we have more overweight people than ever before, and that, in many cases, being overweight correlates with an increased risk of heart and blood vessel disease. These diseases, however, may have as much to do with our way of life and our high-fat diets as with excess weight. And the associated risk of cancer in the digestive system may be more of a dietary problem-too much fat and a lack of fiber-than a weight problem. The real concern, then, is not that we weigh too much, but that we neither exercise enough nor eat well. Exercise is necessary for strong bones and both heart and lung health. A balanced diet without a lot of fat can also help the body avoid many diseases. We should surely stop paying so much attention to weight. Simply being thin is not enough. It is actually hazardous if those who get (or already are) thin think they are automatically healthy and thus free from paying attention to their overall life-style. Thinness can be pure vain glory.

单选题It can be inferred from the passage that kerosene was preferable to whale oil because whale oil was too_______.

单选题Cell Phone Lets Your Secret Out Your cell phone holds secrets about you. Besides the names and (51) that you've programmed into it, traces of your DNA linger(逗留) on the device, according to a new study. DNA is genetic(遗传的) material that (52) in every cell. Like your fingerprint, your DNA is unique to you (53) you have an identical twin. Scientists today routinely analyze DNA in blood, saliva(涎，唾液), or hair left (54) at the scene of a crime. The results often help detectives identify (55) and their victims. Your cell phone can reveal more about you (56) you might think. Meghan J. McFadden, a scientist at McMaster University in Hamilton, Ontario, heard about a crime in which the suspect bled onto a cell phone and later dropped the (57) This made her wonder whether traces of DNA lingered on cell phones -- even when no blood was involved. (58) she and colleague Margaret Wallace of the City University of New York analyzed the flip-open phones(翻盖手机) of 10 volunteers. They used swabs(药签) to collect (59) traces of the users from two parts of the phone: the outside, where the user holds it, and the (60) , which is placed at the user's ear. The scientists scrubbed(用力擦洗；擦净) the phones using a solution made mostly (61) alcohol. The aim of washing was to remove all detectable traces of DNA. The owners got their phones (62) for another week. Then the researchers collected the phones and repeated the swabbing of each phone once more. The scientists discovered DNA that (63) to the phone's speaker on each of the phones. Better samples were collected from the outside of each phone, but those swabs also picked up DNA that belonged to other people who had apparently also handled the phone. (64) , DNA showed up even in swabs that were taken immediately after the phones were scrubbed. That suggests that washing won't remove all traces of evidence from a criminal's device. So cell phones can now be added to the (65) of clues that can clinch(确定，决定) a crime-scene investigation.

单选题Mary gets up at six o'clock every morning. A．rises B．stands C．arrives D．comes

单选题 The Natural Balance being Altered The balance of nature is a very elaborate and delicate system of check and countercheck. It is continually being altered as climates change, as new organisms evolve, as animals or plants spread to new areas. But the alterations have in the past, for the most part, been slow. whereas with the arrival of civilized man, their speed has been multiplied much: from the evolutionary time-scale, where change is measured by periods of ten or a hundred thousand years, they have been transferred to the human time-scale in which centuries and even decades count. Everywhere man is altering the balance of nature. He is facilitating the spread of plants and animals into new regions. Sometimes deliberately, sometimes unconsciously. He is covering huge areas with new kinds of plants, or with houses, factories, slagheaps and other products of his civilization. He gets rid of some species on a large scale, but favors the multiplication of others. In brief, he has done more in five thousand years to alter the biological aspect of the planet than has nature in five million years. Many of these changes which he has brought about have had unforeseen consequences. Who would have thought that the throwing away of a piece of Canadian waterweed would have caused half the waterways of Britain to be blocked for a decade? Or that provision of pot cacti for lonely settlers' wives would have led to Eastern Australia being covered with forests of prickly pears? Who would have predicted that the cutting down of forests on the Adriatic coast, or in parts of Central Africa, could have reduced the land to a semi-desert with the very soil washed away from the bare rock? Who would have thought that improved communications would have changed history by the spreading of disease-sleeping sickness into East Africa, measles into Ocean. AIDS around the whole world? These are spectacular examples, but examples on a smaller scale are everywhere to be found. We made a nature sanctuary for rare birds, providing absolute security for all species; and we may find that some common and hardy kind of birds multiplies beyond measure and drive away the rare kinds in which we are particularly interested. We see, owing to some little change brought about by civilization, the starting spread over the English countryside in hordes. We improve the yielding capacities of our cattle; and find that how they exhaust the pastures which were sufficient for less demanding stock. We gaily set about killing the carnivores that disturb our domestic animals, the hawks that eat our fowls and game-birds; and find that in so doing we are also removing the brake that restrains the multiplication of mice and other little rodents that gnaw away the farmers' profits.

单选题The minimum age of Chinese citizens who are eligible to vote is eighteen.A. encouragedB. enforcedC. entitledD. expected

单选题In the near future we can Ulook for/U more women in leadership roles.

单选题Night of the Living Ants When an ant dies, other ants move the dead insect out of the nest. This behavior is interesting to scientists, who wonder how ants know for sure and so soon that another ant is dead. Dong-Hwan Choe, a scientist at the University of California found that Argentine ants have a chemical on the outside of their bodies that signals to other ants. "I'm dead. Take me away." But there's a twist to Choe's discovery. These ants are a little bit like zombies (僵尸). Choe says that the living ants, not just the dead ones, have this death chemicals. In other words, while an ant crawls around, perhaps in a picnic or home, it's telling other ants that it's dead. What keeps ants from hauling away the living dead? Choe found that Argentine ants have two additional chemicals on their bodies, and these tell nearby ants something like, "Wait-I'm not dead yet." So Choe's research turned up two sets of chemical signals in ants: one says, "I'm dead," the other set says, "I'm not dead yet." Other scientists have tried to figure out how ants know when another ant is dead. If an ant is knocked unconscious, other ants leave it alone until it wakes up. That means ants know that unmoving ants can still be alive. Choe suspects that when an Argentine ant dies, the chemical that says "Wait-I'm not dead yet" quickly goes away. Once that chemical is gone, only the one that says "I'm dead" is left. "It's because the dead ant no longer smells like a living ant that it gets carried to the graveyard, not because its body releases new unique chemicals after death," said Choe. When other ants detect the "dead" chemical without the "not dead yet" chemical, they haul away the body. This was Choe's hypothesis (假设). To test his hypothesis, Choe and his team put different chemicals on Argentine ant pupae (蛹). When the scientists used the "I'm dead" chemical, other ants quickly hauled the treated pupae away. When the scientists used the "Wait-I'm not dead yet" chemicals, other ants left the treated pupae alone. Choe believes this behavior shows that the "not dead yet" chemicals override (优先于) the "dead" chemical when picked up by adult ants. And that when an ant dies, the "not dead yet" chemicals fade away. Other nearby ants then detect the remaining "dead" chemical and remove the body from the nest.

单选题Parents who lack the finance to send their children to a private school have to Utolerate/U the state system.

单选题Ms Hawkins handles the company's accounts. A. deals with B. deals in C. holds on D. holds out

单选题All the cars are tested for defects before leaving the factory.A. functionsB. faultsC. motionsD. parts

单选题He denies involvement with either drugs or the CIA.

单选题Although originally a German innovation, kindergarten got its real start in the United States as a movement to provide an improved learning environment for children.

单选题The plane will be taking off in {{U}}approximately{{/U}} 10 minutes.

单选题Cell Phone Lets Your Secret Out Your cell phone holds secrets about you. Besides the names and (51) that you've programmed into it, traces of your DNA linger on the device, according to a new study. DNA is genetic material that (52) in every cell. Like your fingerprint, your DNA is unique to you (53) you have an identical twin. Scientists today routinely analyze DNA in blood, saliva, or hair left (54) at the scene of a crime. The results often help detectives identify (55) and their victims. Your cell phone can reveal more about you (56) you might think. Meghan J. McFadden, a scientist at McMaster University in Hamilton, Ontario, heard about a crime in which the suspect bled onto a cell phone and later dropped the (57) . This made her wonder whether traces of DNA lingered on cell phones even when no blood was involved. (58) she and colleague Margaret Wallace of the City University of New York analyzed the flip-open phones of 10 volunteers. They used swabs to collect (59) traces of the users from two parts of the phone: the outside, where the user holds it, and the (60) , which is placed at the user's ear. The scientists scrubbed the phones using a solution made mostly (61) alcohol. The aim of washing was to remove all detectable traces of DNA. The owners got their phones (62) for another week. Then the researchers collected the phones and repeated the swabbing of each phone once more. The scientists discovered DNA that (63) to the phone's speaker on each of the phones. Better samples were collected from the outside of each phone, but those swabs also picked up DNA that belonged to other people who had apparently also handled the phone. (64) , DNA showed up even in swabs that were taken immediately after the phones were scrubbed. That suggests that washing won't remove all traces of evidence from a criminal's device. So cell phones can now be added to the (65) of clues that can clinch a crime-scene investigation.

单选题She answered the difficult question, which was an {{U}}immense{{/U}} load off her heart. A. natural B. fatal C. tiny D. enormous