题目

电动势为2 V的电池在电路上输出1 A的电流，可以断定（ ）A.内外电阻相差2 Ω                                 B.外电阻为2 ΩC.内电阻为2 Ω                                        D.内外电阻之和是2 Ω 答案：解析：由闭合电路欧姆定律I=已知电动势为2 V，在电路上输出1 A的电流，代入得：R+r＝2Ω，即内外电阻之和是2 Ω，所以A、B、C错，D对.答案：DIn Barnes London Wetland Centre, you can enjoy a large number of wild birds and wild animals. Adults’ fare is ￡7.95, and children’s fare is ￡4.50. But if holding a London pass, you can have free admission(入场).London Wetland Centre is thought to be the European City’s best place to contact wild animals. London Wetland Centre is the UK’s most worthy(值得) of showing off, and the most exciting wildlife projects, including 43 hectares of grassland, as well as pools.Barnes wetlands are located(位于) in the Thames. This award-winning centre always interest many scientists. There are many different kinds of animals, including the cormorant(鸬鹚)，the Kingfisher(翠鸟) and the endangered water vole(河鼠).In London Wetland Centre there are a large number of different habitats. When visiting the centre, visitors can watch movies through the video to learn more about wetlands and the knowledge of biological species(生物种).For children, London Wetland Centre is a good choice to learn a lot about the knowledge of nature.There are many other interesting places about wildlife. If you are interested in wildlife, why not go to London Zoo, Regent(丽晶)Park or River Thames downstream to experience the world’s most beautiful gardens. Holders of London Passes can visit them freely.1.The Wetland Centre in the passage is in the__________ .A. USA B. PRC C. UK D. UN2.London Wetland Centre includes __________ hectares of grassland.A. 4 B. 3 C. 43 D. 343. At the _____, visitors can learn more about wetlands and the knowledge of biological species.A. Tower Bridge B. London Wetland Centre C. Big Ben D. London Tower4.What’s the Chinese meaning of the underlined word ‘downstream’?A. 干流 B. 支流 C. 上游 D. 下游5.Two children without London Pass want to go into the London Wetland Centre. They will pay ______.A. ￡4.50 B. ￡9.00 C. ￡7.95 D. ￡9.95