【正文】 ars later as World War I came to a close. Task 5 【答案】 A. People have different opinions on using animals for research. B. 1) for a. was tried first on animals. b. is dependent on c. using unwanted animals. 2) against a. suffer b. unnecessary c. the same rights 3) a. cell culture b. puter modeling. 【原文】 Every year about 17 million animals are used in Laboratory experiments. But in many countries today, a difficult question is being asked: Do we have the right to use animals in this way? People who are for using animals in research argue that the use of animals in medical research has many practical benefits. Animal research has enabled researchers to develop treatments for many diseases, such as heart disease and depression. It would not have been possible to develop vaccines for diseases like smallpox and polio without animal research. Every drug anyone takes today was tried first on animals. Future medical research is dependent on the use of animals. Which is more important: the life of a rat or that of a threeyearold child? Medical research is also an excellent way of using unwanted animals. Last year, over 12 million animals had to be killed in animal shelters because no one wanted them as pets. However those who are against it point out that the fact that humans benefit cannot be used to justify using animals in research any more than it can be used to justify experimenting on other humans. Animals suffer a lot during these experiments. They are forced to live in small cages, and they may be unable to move. Much of the research that is carried out is unnecessary anyway. Animals have the same rights as humans do — to be able to move freely and not to have pain or fear forced on them. Researchers must find other ways of doing their research, using cell culture and puter modeling. There should be no animals in research laboratories at all. Task 6 【答案】 A. 1) No. 2) Because zoo officials want him to produce cubs with another female tiger, so they don‘t want him to bee too interested in this family. B. 1) four months 2) 13 kilograms 3) horse meat, their mother‘s milk. 4) the National Zoo‘s Website C. 1) c, 2) c, 3) b 【原文】 Visitors to the National Zoo in Washington D. C. can see three new young tigers. The rare babies met the public for the first time late last month. Chip O‘Neal tells us about them. The mother tiger sat nearby on the grass as her babies rolled, chased and bit each other playfully. Then Korenchy also jumped into the games. Her cubs were born at the zoo four months ago. They are called Mike, Eric and Chrisy. The new young tigers at the National Zoo each weigh about 13 kilograms. Their fur is dark orange with black stripes. They eat horse meat and drink milk from Korenchy. Korenchy and her babies are Sumatran tigers. Sumatran tigers came from the Indonesian island of Sumatra. They are now in danger of disappearing from the earth. Fewer than 500 of these tigers remain in the world. That includes about 60 living in zoos in North America. Korenchy came to the National Zoo from the Jakarta Zoo in Indonesia. The girl was part of the Sumatran Tiger Species Survival Program. Korenchy has given birth to live cubs three tines. The father of her new cubs is Rokan, a Sumatran tiger who arrived two years ago from another zoo. Korenchy and Rokan had their babies the natural way instead of the scientific method often used to produce young animals in zoos. A wire fence separates Rokan from his babies. Zoo workers who care for Rokan say he reaches through the fence to wash the cubs with his tongue. They say this means he recognizes Mike, Eric and Chrisy as his cubs. However, zoo officials are hoping that Rokan will produce more cubs with another female Sumatran tiger at the zoo, so they do not want him to bee too interested in this family. The National Zoo hopes to keep the Sumatran tiger cubs for at least 18 months before sending them to other zoos. That is about the age when most tiger cubs in the wild leave their mothers. The National Zoo has placed cameras in the Sumatran tigers‘ living area, so people with puters can see them. To do this, use your puter to find the National Zoo‘s Website at . Task 7 【答案】 A. 1) Cats have been more popular, because there are more pet cats in American homes. 2) About 8,000 years 3) They probably arrived in the United States from Europe. 4) No. B. 1) a) food especially prepared for cats b) other equipment c) with images of cats d) in special burial grounds 2) a) pleasure b) care c) being alone d) independent C. 1) F, 2) F, 3) T, 4) F, 5) F 【原文】 An old expression says, ―Man‘s best friend is his dog.‖ Today, however, it seems that cats have replaced dogs as the most popular pets in American homes. Americans have more than 62 million pet dogs. But even more cats — more than 64 million — live in American homes. These pet cats may have long hair or short hair. They are different colors and sizes. Some are costly animals that take part in petitions. Many more are mon American mixtures of several kinds of cats. Most house cats live a good life. They are not expected to work for their food. Instead, they rule their homes like furry kings and queens. They wait for their owners to serve them. Americans are increasingly serious about their cats. These concerns have made the care of cats into big business. Each year, cat owners buy tons of food especially prepared for cats. They buy toys and other equipment. They buy jewelry and clothes for themselves with images of cats on them. Some owners even bury their dead pets in special burial grounds. Humans have loved and respected cats for centuries. Scientists have evidence that cats and people lived together as long as 8000 years ago. The small house cat was once