分析 这篇短文主要介绍了卫星定位系统的工程及工作原理.卫星定位系统能让你知道自己在哪儿,不会在新城市中迷路.卫星定位系统有三个部分,第一部分是接收机.第二部分是一组围绕地球卫星接收器触点.第三个部分的系统是一个地面站网络.卫星定位系统在日常生活中会像手机一样普遍.
解答 56.A 细节理解题. 根据短文第一段It can find your position within 20meters.A GPS cannot start your car,but at least you will know where you are,可知卫星定位系统能让你知道自己在哪儿.故选A,不会在新城市中迷路.
57.C 细节理解题.根据第三段There are three parts to the Global Positioning System.描述,可知卫星定位系统有三个部分.故选C.
58.D 细节理解题.联系上文The third part of the system is a network of ground stations系统的第三部分是地面接收站.描述,可知指的是地面接收站.故选D.
59.B 细节理解题.这篇短文主要介绍了卫星定位系统的工程及工作原理.故选B,介绍卫星定位系统.
60.D 细节理解题.根据短文最后一段Some people think that in the future the GPS will be as common as the mobile.They are becoming cheaper and more and more accurate(精确).可知卫星定位系统在日常生活中会变得越来越普通.故选D.
点评 做题时要在理解好文意的基础上,与题目有机的结合,从文章中找到相关细节性的句子与选项细细比对,进行选择或推理判断,选出符合文章内容的正确选项.做题注意灵活,有时可采用排除法或直选法确定出最终答案.
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