题目

有两只灯泡L1和L2，分别标有“PZ110―40”、“PZI10―60”字样，若不考虑温度对电阻的影响。下列说法正确的是 A．正常发光时，通过L1的电流大     B．并联后，接在110V的电源上，L2消耗的功率大     C．串联后，接在220V的电源上，它们都能正常发光     D．串联后，接在110V的电源上，L1消耗的功率大 答案：BD Read the passage carefully and complete the table with only one word for each blank. Many countries around the world have National Parks. There are about 7, 000 National Parks around the world. Most of them protect natural settings as well as the plants and animals that live there, but a few are in towns and cities. Are National Parks in England the same as those in other countries?Many National Parks around the world are huge in area but without any people, but in England most of the countryside within them is useful for farming and other activities. As a result, National Parks in England include places where people live and work, as well as wild and beautiful areas where there is a sign of human life. Why do visitors go to the National Parks?There are plenty of activities to do in all of the National Parks in England. Visitors can walk or cycle, following marked route, and many of the parks organize activities for families. Are there any problems in the National Parks?There are about 110 million visitors to the parks every year, bringing many benefits(好处） to the areas but causing problems too. Many popular towns and villages can be filled with visitors. This results in overcrowded car parks and roads blocked with traffic. Life can be difficult for people who live there, as more and more gift shops and cafes are opened instead of those everyday shops; in popular areas, house prices can become too high for local people to afford,which makes it hard for them to stay in the area. Another major problem is litter. In the parks it is a particular danger to animals. Broken glass can also cause fires by focusing the rays of the sun. When these start in wild places, they are much harder to control and can damage large areas very quickly. How can people help?All National Parks in England promote (倡导) the Countryside Code, which tells people how to take care of their environment. If these rules are followed, the National Parks will be protected and continue to give pleasure to many people for a long time. And of course people who are against the rules must be fined. National Parks in EnglandPurpose◆ Like many National Parks around the world, the National Parks in England are also to protect nature. Functions◆ Many National Parks around the world cover huge areas of land where 1. lives, while most of the countryside in National Parks in England is used for farming and other activities.◆ Visitors can walk or cycle, following marked routes, and many activities are 2. for families.Problems◆ Too many visitors can cause heavy traffic.◆ The disappearance of everyday shops makes life difficult.◆ Local people are almost unable to 3. the houses in popular areas.◆ Litter is particularly 4. to animals. Fires caused by broken glass can damage large areas very quickly.5.to these problems ◆ People should follow the rules of the Countryside Code.◆ People who break the rules must be fined