世界上首条实现商业运营的1000千伏特高压交流输电线路是（）。 _环保知识竞赛_全学科试题题库

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世界上首条实现商业运营的1000千伏特高压交流输电线路是（）。
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Im a 43-year-old mother of three young kids with a Master of Science degree. I also【C1】______pizzas for a living. I started doing it after【C2】______home with my children for four years. Caring for your kids all day is a【C3】______opportunity for many women, but it wasnt right for me. I began suffering from【C4】______and decided to get a job so Id have more of my own identity. Now I work nights when my husband is home so we dont have to【C5】______child care. After I learned the basics of pizza delivery—like getting the【C6】______together and not getting lost—I began my new "career" . Being【C7】______and organized by nature, 1 studied the tipping patterns of the town. Our community had a small, expensive liberal-arts【C8】______full of students who ordered lots of pizzas. Most of the kids were friendly and polite.【C9】______Friday and Saturday nights, some of the dorms had huge parties.【C10】______the stairs were sticky from beer and the music was so loud they couldnt【C11】______me knock on the door, the crowds of happy students shouting, "Pizza! Pizza!" always let me through. The first few days of each month, one of us drivers would take【C12】______turn covering the public-housing developments. These customers did not always tip well,【C13】______I always liked seeing the children and adults sitting outside and【C14】______the evenings when the weather was nice. I also deliver to multimillion dollar homes now, but the【C15】______I make in tips has stayed the same. As I【C16】______to these beautiful houses, its easy to fantasize about a【C17】______tip. The person who answers the door always【C18】______young and, like the members of my own family,【C19】______educated. All I usually get is a brief "Thank you" and a dollar or two. People might say Im crazy to waste my education, but I have【C20】______most of them dont: a job I love.【C1】A．buyB．waitC．turnD．deliver