题目

中国内地的免疫手段是世界上最先进和效果最好的，今年初投入使用的禽流感-新城疫重组二联活疫苗，是中国最新自行研制的疫苗，既价格低廉又使用方便，可以用滴鼻、饮水、点眼等多种方式实施，减轻了免疫工作的劳动强度，减少了免疫的风险，更利于免疫工作的开展。这说明技术具有（）的作用。 A . 保护人 B . 发展人 C . 防范人 D . 限制人阅读下列短文，从各小题所给的A、B、C、D四个选项中选出一个能回答所提问题或完成所给句子的最佳选项。AYears ago, as we know, zoos kept animals in cages. Cages made it easy for visitors to see the animals, but a small cage is not a good place for an animal to live in.Today animals live in open areas. There are usually plants and a little lake around, like the animals' habitats. Visitors usually stay in the bus to see the animals outside.Zoos help to protect all kinds of animals. They protect animals in the zoo as well as animals in the wild. How do they do this? Zoos tell people how animals live in the wild and how to help protect their environment.The number of many kinds of plants and animals is becoming smaller and smaller. Mammoths, which are related with Asia elephants, are now extinct（已灭绝的.Scientists say that 74 different kinds of living things are disappearing a day!Zoos are working together to help animals-our friends.1.In the past, zoos kept animals in cages so that people can ________.A. protect them B. see them betterC. feed them D. save them2.Today, zoos keep animals ________ .A. in open areas B. in bigger cagesC. in smaller cages D. in the buses3.To protect animals, zoos ________.A. are trying to keep all kinds of animalsB. are trying to free the animalsC. tell people more about animalsD. want people to feed the animals4. A mammoth is a kind of ________ that has gone extinct.A. plant B. birdC. animal D. tree5. An animal or a plant that is going extinct________ .A. has more and more living membersB. comes into this world soonC. becomes very dangerousD. has fewer and fewer living member