【文章內(nèi)容簡介】 ials of different levels． Any students who master concepts can move upward between groups， and the student groups might look different from subject to subject and unit to unit． For instance， a student who stands out in language arts might be at an average or slower level in math． A student who flies through multiplication tables might need extra help with fractions． Students who lag in reading can be pulled out of the classroom in small groups for practice with a tutor until their reading improves． Research shows ability grouping within classes has more positive benefits than tracking． However， that must be weighed against the challenges involved． In many regular classrooms， the differences between student ability levels are very big． That presents challenges for teachers and low﹣ performing students to constantly pare themselves with students who seem to fly through school with ease． The rigid ability groups and tracking of the past are still with us in many schools. Likely, labels are applied with more caution than in the bad old days when some teachers gave reading groups not﹣ so﹣ secret code names like ―Bluebirds‖Robins‖‖Crows‖and‖ Buzzards． But kids still know． 56． By saying Movement between the tracks is rare． in Paragraph 3， the writer really means A． tracking children is normal in Asia B． school﹣ wide tracking has decreased in US C． professional and vocational careers are unrelated D． sorted students can hardly change schools 57． What might be the challenge in regular classrooms for teachers? A． Students 39。different levels． B． Students39。 low performance． C． Constant self﹣ parison． D． Application of not﹣ so﹣ secret code． B. For centuries, medical pioneers have refined a variety of methods and medicines to treat sickness, injury, and disability, enabling people to live longer and healthier lives. ―A salamander (a small lizardlike animal) can grow back its leg. Why can39。t a human do the same‖ asked Peruvianborn surgeon Dr. Anthony Atala in a recent interview. The question, a reference to work aiming to grow new limbs for wounded soldiers, captures the inventive spirit of regenerative medicine. This innovative field seeks to provide patients with replacement body parts. These parts are not made of steel。 they are the real things living cells, tissue, and even ans. Regenerative medicine is still mostly experimental, with clinical applications limited to procedures such as growing sheets of skin on burns and wounds. One of its most significant advances took place in 1999， when a research group at North Carolina‘s Wake Forest Institute for Regenerative Medicine conducted a successful an replacement with a laboratorygrown bladder. Since then, the team, led by Dr. Atala, has continued to generate a variety of other tissues and ans 一 from kidneys to ears. The field of regenerative medicine builds on work conducted in the early twentieth century with the first successful transplants of donated human soft tissue and bone. However, donor ans are not always the best option. First of all, they are in short supply, and many people die while waiting for an available an。 in the United States alone, more than 100,000 people are waiting for an transplants. Secondly, a patient‘s body may ultimately reject the transplanted donor an. An advantage of regenerative medicine is that the tissues are grown from a patient‘s own cells and will not be rejected by the body‘s immune system. Today, several labs are working to create bioartificial body parts. Scientists at Columbia and Yale Universities have grown a jawbone and a lung. At the University of Minnesota, Doris Taylor has created a beating bioartificial rat heart. Dr. Atala‘s medical team has reported longterm success with bioengineered bladders implanted into young patients with spina bifida (a birth defect that involves the inplete development of the spinal cord). And at the University of Michigan, H. David Humes has created an artificial kidney. So far, the kidney procedure has only been used successfully with sheep, but there is hope that one day similar kidney will be implantable in a human patient. The continuing research of scientists such as these may eventually make donor ans unnecessary and, as a result, significantly increase individuals‘ chances of survival. 58. In the latest field of regenerative medicine, what are replacement parts made of A. Donated cells, tissues and ans. B. Rejected cells, tissues and ans. C. Cells, tissues and ans of one‘s own. D. Cells, tissues and ans made of steel. 59. Why is generative medicine considered innovative A. It will provide patients with replacement soft tissues. B. It will strengthen the human body‘s immune system. C. It will shorten the time patients waiting for a donated an. D. It will make patients live longer with bioartificial ans. C Laws that would have ensured pupils from five to 16 received a full financial education got lost in the ?wash up‘. An application is calling on the next government to bring it back. At school the children are taught to add up and subtract(減法 ) but, extraordinarily, are not routinely shown how to open a bank account — let alone how to manage their finances in an increasingly plex and demanding world. Today the parenting website Mums and the consumer campaigner Martin Lewis have joined forces to launch an online application to make financial education a pulsory element of the school curriculum in England. Children from five to 16 should be taught about everything from pocket money to pensions, they say. And that was exactly the plan preserved in the Children, Schools and Families bill that was shelved by the government in the socalled ―washup‖ earlier this month — the rush to legislation before parliament was dismissed. C