题目

下列关于导体电阻的说法，正确的是（ ）A. 长度长的导体，电阻一定大B. 横截面积大的导体，电阻一定大C. 导体电阻与导体材料、长度、横截面积等因素有关D. 导体电阻由其两端电压和通过的电流来决定 答案：【答案】C【解析】解：ABC、导体的电阻是导体的一种性质，导体的电阻由导体的长度、横截面积和材料决定；故AB错误，C正确；D、导体的电阻是导体的一种性质，反映了导体对电流阻碍作用的大小；导体的电阻与导体两端电压和电流无关；故D错误．故选C．Read the passage and fill in the blanks with proper words (在短文的空格内填入适当的词，使其内容通顺，每空格限填一词，首字母己给）： During our first summer in the Arizona desert, I got b1. burned by the sun. It was too hot there. By the next April I was already worrying about those three months coming up. I told Mr. Simpson about that at his gas station while he filled my car’s tank.“You don’t need to worry in that way,” he said, “worrying about the heat just makes the summer start sooner or last l2..”I realized, as I paid the bill, that he was right. “Treat the heat like a welcome surprise.” he said. “ Take advantage of the best that our summer offers and ignore (忽视）the r3..”To my surprise, Mr. Simpson’s advice worked. When the hot summer did arrive, I wanted the flowers in my garden in the morning. In the afternoon I slept with my kids, and in the evening we played games and made ice cream together. I l4.the beauty of the summer in the desert.Years later, when we moved to Cleveland, our neighbors there were already worrying about winter in September. When the snows of December did arrive, our children were e5.because they had never seen snow before. They made snowballs and went skating together.One afternoon, a middle-aged neighbor told me, “For years the snow had just been something to shovel (铲子). I’d forgotten what real fun it can be !”A few years later, we moved b6. to the desert. When I drove to the gas station, I learned from the new owner that age had forced Mr. Simpson to sell the station. He had bought a small station nearby.I drove there and talked with Mr. Simpson. He was thinner and older now, but his pleasant smile was s7. the same. I asked him how he was.“ I’m not worrying about growing old.” he said. “ I am too busy e8. life out there in the country.”