【正文】 eople therefore be required to allow their organs to be used by others after death?The British Medical Association (BMA), which represents doctors in Britain, says yes. A system of presumed consent ( 默許) would automatically make everyone over the age of 16 an organ donor .Individuals would be allowed to opt out, that is to say, decide not to be an organ donor, if that39。s what they prefer. The BMA points to much higher organ donation rates in countries that have optout systems, such as Spain, Belgium, Austria and the Czech Republic.England39。s chief medical officer, Sir Liam Donaldson, also wants to change the organdonor system from optin to optout. All of this sounds like very good news for the 7,500 people in the UK who are waiting for transplants of critical organs, tissues, skin and bones.Britain39。s National Health Service (NHS) recently counts million organ donors on a list which began in 1994. Not everyone wants to participate, however, according to the NHS, 90 percent of the British strongly support organ donation, but only 23 percent are on the organdonor list.Why the discrepancy(差異)? One reason is that organ donation is a personal matter. Another reason may be indecision: when families are not sure about a dead relative39。s wishes, 40 percent decide not to donate his or her organs. Interestingly, religion has little to do with a decision not to donate. All six of the main religions in Britain support organ donation and transplantation.The government decided in 2018 how the system of organ donation should work without a policy of presumed consent. Opinion among members of parliament (議會) continues to be divided。 but the tragedy goes on: as things are now, one in 10 Britons in need of an organ will never get one.24. What does the tragedy in refer to?A. People are required to be organ donors.B. Organ transplants could save lives for more than 60 years.C. More and more donors39。 organs are not proper for operation.D. Many patients have to die because of no replacement organ.25. The underlined words opt out in Para. 2 mean_______.A. criticize on donating their organs B. accept organ transplants operationC. persuade their parents not to donate D. choose to be out of the organ donors26. According to Para. 4, most British people______.A. support organ donation without action B. want to participate in organ donationC. are willing to donate their organs D. don39。t like NHS39。 activity27. What39。 s the main idea of the passage?A. Analyzing the tragedy of organ donation.B. Persuading people to support organ donation.C. Praising those people who donate their organs.D. Listing government39。 s measures on organ donation.CWhen she was studying to bee a scientist, Megan Strauss rode in a small airplane to study giraffes. While a pilot flew over the Serengeti in Tanzania, Africa, the researchers looked down carefully and counted giraffes.I am always amazed how easily we can spot warthogs and other small animals, yet we sometimes have trouble seeing giraffes. Giraffes are slender in shape, and they may not throw a good shadow, says Dr. Strauss, who has since bee a wildlife scientist.The Serengeti is about the size of Vermont, a state in the northeastern US, so the scientists could not study the entire area. Instead, they surveyed three areas where giraffes were studied in the 1970s. As they expected, they saw far fewer of these animals.To find out if lions had been killing more giraffes in recent years, the team looked at the survival of young giraffes. Lions kill more young giraffes than adults, but the team found no decrease in young giraffes39。 survival after they are born, pared with the 1970s.The team then looked at whether too many giraffes were being killed by parasites(寄生蟲）.The researchers counted parasite eggs in giraffe droppings, and they found too few to harm the giraffe population.They looked into whether poachers (盜獵者)were killing too many giraffes. Two of the areas they studied are where giraffe meat is sometimes sold in local markets. Poachers catch more adult males than other giraffes. Researchers spotted too few males pared with females in those two areas, a sign of poaching.When the food supply is short, the environment supports fewer giraffes and the females have fewer young giraffes. A lot of new trees have grown in the Serengeti, but many are a type that giraffes do not like to eat. The researchers found fewer young giraffes today than in the 1970s pared with the number of adult females, a sign that food was in short supply.Dr. Strauss is working on an environmental education program for Tanzania including books for students. These materials will educate Tanzanians and help them to help giraffes. As knowledge grows and changes are made, they hope the giraffe population will increase.28. What did Dr. Strauss find while studying giraffes in the Serengeti?A. It was too costly to study giraffes.B. It was hard to spot giraffes from the air.C. The number of giraffes had increased slowly.D. Giraffes lived in smaller areas than in the 1970s. did the team study the liongiraffe relationship?A. By analyzing giraffe droppings. B. By paring young giraffes with adults.C. By paring male giraffes and females. D. By surveying the survival of young giraffes. are the causes of a reduction in giraffes population in the Serengeti? A. Lions and parasites. B. Lack of food and poaching. C. New trees and local markets. D Illegal hunting a