题目

两物体A、B静止于同一水平面上，与水平面间的动摩擦因数分别为μA和μB，它们的质量分别为mA和mB，用平行于水平面的力F拉动物体A、B，所得加速度与拉力的关系如图A-1所示，则（）                 答案：B【试题分析】All young people dream of travelling the world. They are restless and very eager to see new sights. However, they have little idea how they would really do it if given the chance. Because their knowledge of geography is quite limited, they seldom know much about the places they wish to visit or how they would get there.Already hundreds of thousands of Chinese student tourists are visiting these places-Wuyi, Lhasa, Lijiang, Dali, Vientiane and Phnom Penh. Indeed, these students will soon be the most travelled generation in China’s long history. The World Tourist Organization predicts that a quarter of a century from now the number of Chinese tourists going abroad will be twenty times what it is today. The largest percentage of these tourists will visit Southeast Asia. Not all Chinese who travel abroad will be tourists, however. More and more youths are deciding to volunteer their skills in this region; much like their peers in the Peace Corps and VSO.Critical thinking skills required include planning for a trip and solving problems after the trip has begun. The focus is on how to read an atlas (地图集) to make travel plans and how to find ways of travelling. An atlas offers a wealth of information about geography and is one way to increase students’ awareness of their global environment. Use of an atlas especially addresses the needs of students with different visual and spatial (空间的) learning styles.【小题1】The main idea of the first paragraph is ________.A．all young people wish to travel around the worldB．all young people like to learn the knowledge of geographyC．all young people like travelling but their knowledge of geography is quite limitedD．all young people are aware of the places they are going【小题2】These places, Wuyi, Lhasa, Lijiang, Dali, Vientiane and Phnom Penh, lie in ________.A．ChinaB．EuropeC．VietnamD．Asia【小题3】Which of the following statements is TRUE?A．The number of Chinese tourists going abroad will be twenty times what it istoday in about 25 years.B．The number of Chinese tourists going abroad will be twenty times what it is today in about 10 years.C．Southeast Asia will become the most popular visiting place in the world.D．Young people will be addicted to Internet travelling.【小题4】One way to increase students’ awareness of their global environment is for them to ____A．watch TVB．listen to radio newsC．read an atlasD．plan a trip【小题5】The underlined phrase “a wealth of” can be replaced by “_________”.A．a number ofB．a great manyC．a great many ofD．a great deal of