问题
填空题
如图所示是一款具有摄像功能的手机，摄像机的镜头相当于一个______透镜，通过镜头所成的像是______（选填“实像”或“虚像”）．
答案
摄像机的镜头相当于一个凸透镜，
其成像的原理是：当物距大于二倍焦距时，凸透镜成倒立缩小的实像．
故答案为：凸；实像．
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如图所示是一款具有摄像功能的手机，摄像机的镜头相当于一个______透镜，通过镜头所成的像是______（选填“实像”或“虚像”）．
摄像机的镜头相当于一个凸透镜，
其成像的原理是：当物距大于二倍焦距时，凸透镜成倒立缩小的实像．
故答案为：凸；实像．
| 阅读理解 | ||||
| In the past, people used to travel to foreign countries because they thought they would be different in many ways - the buildings, the food, the national dresses and so on. At present, however, one large city is similar to another. They all have their Hilton or Sheraton Hotels everywhere. They all have their McDonald's, their KFCs and their Pizza Huts. Office buildings look the same everywhere, and most city centers are full of office buildings. And of course, people are driving the same brands(品牌) of Japanese or European cars. Then what is the foreign travel for? What do tourists hope to experience in a foreign country that they can not experience at home? The answer could be that people are very interested in the past. It is a nation's history and culture that are the main attractions. Most people travel overseas to find out what foreign countries history and cultures used to be like, not what they are like today. Tourists try to learn the history and culture of foreign countries by visiting different kinds of museums. Every country also has its own beautiful places for tourists to visit. Their own special scenery (风景) would certainly attract tourists from other countries. Finally, there is perhaps a country's attraction: its people. A country is not just its old buildings, its works of art(艺术品) or beautiful places, it's also the people who live in it. This is why a country such as Thailand attracts millions of people. The tourists come mainly because of the friendliness (友好) of the people there. It is why the Pacific islands are also so popular. The friendly, smiling people make visitors feel welcome. The 1 of Tourism
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