篇章训练【芝麻开门】谋篇布局的方法有很多种，今天我们就这方面所学的知识加以操练。One for all, all for one.我为人人，人人为我。【活动教室】Passage 1.请用一支彩笔把下面文章中首段和末段中的背景内容划出来，找出这两段的中心思想。Zoo AnimalsHuman beings have always wanted to hunt wild animals, not only for food or sport, but also to keep in captivity. Many cities have zoos with a large collection of animals on show. Some zoos such as the Singapore Zoo and Taronga Park in Sydney are famous tourist attractions. Zoos have both positive and negative aspects. Sometimes keeping animals in captivity benefits the humans and sometimes the animals benefit; but, at times, the animals suffer as a result of their confinement.Zoos give most people in the world their only opportunity to study wild animals at close quarters. Even people who are lucky enough to go on a wild life safari in Africa are not able to see animals at such close range. In some zoos in Australia it is possible for visitors to wander among animals such as kangaroos and deer and feed them by hand. For urban children it is a delight to actually see the animals which they have seen on television. Zoos also provide scientists with the opportunity to study animals over a period to time.Scientific research conducted on zoo animals adds to human knowledge, and it benefits animals too. Treatments for diseases which have been developed for animals in captivity can be made available for all animals. Another advantage of having zoos is the possibility they provide for captive breeding programs. Animals’ species which are endangered or on the edge of extinction can be encouraged to breed within a controlled, protective environment. This is crucial for such animals as wh...
