抗美援朝的上甘岭战役中，通信英雄牛宝才，在电话线被炸飞一段而无法联络的紧要关头，他将电话线的一端咬在嘴里，另一端捏在手里，不惜将自己的身体作为__________ （填 “导体”或“绝缘体”）连接被炸断的电话线，保证了指挥联络关键的3分钟，谱写一曲英雄主义的诗篇。今天，我们随时随地要注意人身安全，如若遇到断落地面的电线，我们__________用手直接去捡拾（填“能”或“不能”）。
导体 不能
题目分析：电话线是传递电信号的，原理是声音信号和电信号之间相互转换，牛宝才通过自己的身体把电话线接通，使电流流过自己的身体，说明身体是导体。若遇落地的电线，由于不能确定是否带电，所以不能用手直接捡拾以免触电事故发生。
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| Growing up on a remote Michigan farm, Henry Ford, the founder of the Ford Motor Company, knew little of farming. Like most pioneer farmers, his father, William, hoped that his eldest son would 1 him on the farm, enable it to expand, and eventually take it 2 . But Henry proved a 3 . He hated farm work and did everything he could to 4 it. It was not that he was lazy. 5 from it! Give him a mechanical job to do, from mending a gate to sharpening tools, 6 he would set to work eagerly. It was the daily life of the farm, with its dull tasks, 7 upset him. Henry was excited by the development in technology that could 8 farmers like his father from wasteful and 9 labor. But these developments, in Henry's boyhood, had touched farming 10 at all and farmers went on doing things in the way they had always done. So Henry 11 his attention elsewhere. When he was twelve, he became 12 in clocks and watches. Soon he was repairing them for friends, working at a bench he built in his bedroom. In 1876, Henry suffered a serious 13 . His mother died in childbirth. 14 was no reason for him to stay on the farm, and he 15 to get away as soon as he could. Three years later, he took a job as a mechanic in Detroit. 16 this time steam engines had joined clocks and watches as objects of Henry's fascination. Making and installing them was the business of the Detroit workshop that he joined at the age of sixteen. A chance meeting with an old co-worker 7 a job for Henry as an engineer at the Edison Detroit Electricity Company. When he quickly learned the ropes of his new job, his interest in fuel engines had come to control his life. Henry learned 18 a slow, painstaking business it was to build an engine by hand. Every piece of every part had to be made individually, checked and rechecked, and tested. 19 the burden, he joined forces with another mechanic, Jim Bishop. Even so, it was two years 20 they succeeded in building a working car. Henry called it "Quadricycle." (四轮驱动脚踏车) | ||||
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