问题
选择题
阅读下文：在通常情况下，硫化氢是一种没有颜色、具臭鸡蛋气味的有毒气体，经空气重，能溶于水．在空气中点燃硫化氢气体有二氧化硫和水生成．硫化氢的实验室制法是用块状硫化亚铁和液体状稀硫酸反应，则属硫化氢的化学性质的是[ ]
A．无色
B．有臭鸡蛋气味
C．比空气重
D．能燃烧
答案
答案：D
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阅读下文：在通常情况下，硫化氢是一种没有颜色、具臭鸡蛋气味的有毒气体，经空气重，能溶于水．在空气中点燃硫化氢气体有二氧化硫和水生成．硫化氢的实验室制法是用块状硫化亚铁和液体状稀硫酸反应，则属硫化氢的化学性质的是[ ]
A．无色
B．有臭鸡蛋气味
C．比空气重
D．能燃烧
答案：D
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| Flying like a bird has been the dream of humans since ancient times. Last week a group of modern birdmen put their courage on their wings and 1 gravity in Hangzhou, Zhejiang Province. "Yes, you can buy a ticket and fly to another city. But running with your own wings and feeling your feet ready to 2 is totally different, "Dong Fang, a middle school student in Hangzhou who 3 a home- made aircraft competition, said in an excide voice. 4 by the Intemational Bognor Birdman Competition in the UK, the competition in Hangzhou was a similar event. The Bognor Birdman Competition startde in l97l in the England coastal city Bognor. People ran off the end of a pier (码头)with their own aircraft in a(n) 5 to "fly" the farthest distance. In the competition, a teacher called Ni was amazed to see how imaginative the students were. He was surprised to see his students create 10 different aircrafts with all kinds of material 6 in the past month. "We'd rather call ourselves dreamers 7 pilots because whether our wings really leave the ground,our dream really flies," said Dong Fang. Jing Yuchen and his team named their plane "weiming E", which 8 an unknown goose. The 17-year-old boy deeply believes their goose of steel pipe and sailcloth will honour its name by successfully making it fly. "Our work is much more imaginative than others. With several colourful balloons on its back and a pair of light plastic wings, it is 9 the most eye-catching work, if not the best," said Yu Liang, another student. "Although nlost of those home-made aircrafts cannot really take the boys flying, the boys' braveness and 10 in this project will encourage every one of them to fly high in the future," Ni said. | ||||
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