单选题Suppose you make your parents so happy, they decide to have another baby just like you. It might be flattering(讨人喜欢的), but how would you feel about having a little brother or sister who is also your twin? A laboratory experiment conducted last fall suggests it may someday be possible. For the first time ever, scientists made exact copies, or clones(克隆), of a human embryo. Although the embryos grew for only six days, cloned embryos could theoretically be implanted in a woman's womb(子宫)and develop into normal babies. Or they could be frozen and implanted years later. The scientists developed their cloning technique to make it easier for childless couples to have babies by in vitro(在体外的)fertilization. In this procedure, sperm(精子) from the man fertilizes an egg from the woman in a laboratory dish. In most case, doctors must try implanting several embryos before one stays in the womb. Cloned embryos would give them many more embryos to implant. But the technique could also be used for other purposes. Parents might freeze embryos cloned from their children so that they could be replaced if any of them died. The clones would also be ideal donors if the children needed organ transplants. Another possibility: Childless couples could go to a bank of frozen embryos and choose a child just like one who's already living. Some people are concerned that these couples might pick only beautiful, successful children. The ethical dilemmas(困境)of cloning have not yet been discussed fully because the public assumed it was a long way off. Many people are calling for(要求，提倡)controls on cloning immediately before the practice is abused. What do you think?

单选题She exhibited great powers of endurance during the climb.

单选题They have the capabiliy to complete the task in aweek.A. possibilityB. competenceC. courageD. mixture

单选题In the American family the husband and wife usually share important decision making. When the children are old enough, they take part (51) . Foreigners are often surprised by |he permissiveness of American parents. The old rule that "children should be seen and not heard" is rarely (52) , and children are often allowed to do what they wish without strict parental (53) . The father seldom expects his children to obey him (54) question, and children are encouraged to be independent (55) an early age. Some people believe that American parents carry this freedom (56) far. Others think that a strong father image would not (57) the American values of equality and independence. Because Americans emphasize the importance of independence, young people are expected to (58) their parental families by the time they have (59) their late teens or early twenties. (60) , not to do so is often regarded as a failure, a kind of weak dependence. This pattern of independence often results in serious (61) for the aging parents of a small family. The average American is expected to live (62) the age of 70. The job-retirement age is (63) 65. The children have left home, married, and (64) their own households. At least 20 percent of all people over 65 do not have enough retirement incomes. (65) the major problem of many elderly couples is not economic. They feel useless and lonely with neither an occupation nor a close family group.

单选题U. S. Eats Too Much Salt People in the United States consume more than twice the recommended amount of salt, raising their risk for high blood pressure, heart attacks and strokes, government health experts said on Thursday. They found nearly 70 percent of U. S. adults are in high-risk groups that would benefit from a lower-salt diet of no more than 1,500 mg per day, yet most consume close to 3,500 mg per day. "It's important for people to eat less salt. People who adopt a heart-healthy eating pattern that includes a diet low in sodium and rich in potassium and calcium can improve their blood pressure, " Dr. Darwin Labarthe of the Centers for Disease Control and Prevention said in a statement. "People need to know their recommended daily sodium limit and take action to reduce sodium intake. " Labarthe said. The study in CDC's weekly report on death and disease used national survey data to show that two out of three adults should be consuming no more than 1,500 mg of sodium per day because they are black or over the age of 40 — which are considered high-risk groups. Yet studies show most people in the United States eat 3,436 mg of sodium per day, according to a 2005-2006 CDC estimate. Most of the sodium eaten comes from packaged, processed and restaurant foods. The CDC said it will join other agencies in the Health and Human Services department in working with major food manufacturers and chain restaurants to reduce sodium levels in the food supply. Nationwide, 16 million men and women have heart disease and 5.8 million are estimated to have had a stroke. Cutting salt consumption can reduce these risks, the CDC said.

单选题People with heart disease, diabetes and high blood pressure are not suitable for kidney donation.

单选题Americans Get Touchy The New York Times recently reported that American teens are hugging practically everyone they see. Say goodbye to the greetings of the past, from the hands-off "What's up!" to the handshake or high-five. For young people across the country, bugging is the new "Hello". Girls are hugging girls. Boys are hugging boys. Girls and boys are hugging each other. And, like every major trend, there are lots of variations on the form. There're the classic, full-body, arms-around-the-person bear hug, the casual one-armed side hug, the group hug and the hug from behind. There're the handshake that turns into a hug and the hug that turns into a pat on the back. As trends go, this one seems pretty innocent. But some parents, teachers and school administrators are worried nonetheless. Will young people who aren't as comfortable with physical contact feel peer pressured into hugging? Will kids who don't receive hugs feel left out? Could don't an extra-long hug slide into the more ominous territory of sexual harassment? In response to some of these concerns, some schools have set up new rules to limit or eliminate hugging. One school head has created a three-second limitation for hugs at her school. A few schools have taken even more drastic measures, placing a ban on all forms of touching between students. A few important points are being left out of the discussion. While the U.S. has traditionally been reserved about touching--saving hugs and kisses for relatives, romantic partners and very close friends -- people in many other parts of the world have been greeting each other this way for ages. In Latin America or Western Europe, in countries like Spain, France, and Italy, a kiss on the cheek is common among women, as well as among women and men who are not romantically involved. The cheek-kiss varies by region. Sometimes it is just an air kiss blown past the face. In other places, the proper way of greeting is to deliver a kiss upon both cheeks, or sometimes even a triplet of kisses performed by kissing one cheek, then the other, then back to the first. Latin American men are more likely to shake hands when greeting other men, but in some countries like Turkey, its not unusual for men who know each other well to exchange kisses on the cheek. Meanwhile, for the Maori people of New Zealand, a traditional greeting called the "hongi" involves pressing noses together. So, from a global perspective, the new trend of teen hugging in America is not so "new" after all. People all around the world move in close to say hello, and Americans are just now joining in.

单选题Many of their ideas are being incorporated into {{U}}orthodox{{/U}} medical treatment. A.acceptable B.conservative C.western D.conventional

单选题On Sunday afternoons, we always stroll along the river bank, chatting and laughing.A. walkB. runC. sitD. play

单选题He is sure of the coming of investment Uboom/U after adopting the new investment policies.

单选题The old car jolted along the country road at a snail"s pace.

单选题I am very sorry for ringing you late last night.

单选题Police have ruled out robbery as a motive for the murder.

单选题Tears of anguish filled her eyes.

单选题Suddenly, we were awakened by a loud noise outside.A. arousedB. annoyedC. arisenD. aware

单选题She has consolidated her power.A. strengthenedB. wonC. hardenedD. united

单选题Your younger sister will be eligible to vote next year.A. competentB. possibleC. allowedD. enough

单选题He was kept in {{U}}appalling{{/U}} conditions in prison.

单选题Steep stairs can present a particular hazard to older people.

单选题I will not {{U}}tolerate{{/U}} that sort of behavior in my class. A. control B. accept C. observe D. regulate