题目

硅单质及其化合物应用范围很广。请回答下列问题： （1） 制备硅半导体材料必须先得到高纯硅。三氯甲硅烷(SiHCl3)还原法是当前制备高纯硅的主要方法，生产过程示意图如下： ①写出由纯SiHCl3制备高纯硅的化学反应方程式。 ②整个制备过程必须严格控制无水无氧。SiHCl3遇水剧烈反应生成H2SiO3、H2和另一种酸，写出并配平化学反应方程式；H2还原SiHCl3过程中若混入O2 ， 可能引起的后果是。 （2） 下列有关硅材料的说法正确的是________。 A .2008 sadly saw the worst earthquake in China in over 30 years. The Great Sichuan Earthquake was 8 on the Richter scale and killed around 70,000 people in May, not to mention the tens of thousands who were injured or went missing. On 26th January, 2009, the biggest earthquake in India took the lives of 25,000 people. In the morning, when everybody was enjoying holiday, the earthquake began, It was about 7.5 on the Richter scale. "There is nothing left between the sky and the earth any more. Everything has been pulled down. " said one of the villagers alive. " There is no water, no food and no one has come to help." Nobody died in Pakistan, a country next to India. The City of Lahore was lucky. In Lahore American School, where I was studying, all of the students were safe. They were in the field, so most children didn't feel anything. The earthquake was felt by the teachers that were on the second floor. However, though Mrs Young was also on the second floor, she didn't feel anything. She didn't know what happened until a teacher told her about it. Those teachers who were on the other floors had different feelings. Mr Emond, the maths teacher from Australia, said that when the earthquake started he thought there was something wrong with him, but then another teacher said that it was an earthquake. After those words Mr Emond felt better. Mrs Davis and Mr Frost didn't feel anything either. My mother didn't feel anything. She didn't even know that it was an earthquake till she saw a shaking light. My dad saw the computer shaking and then he looked out of the window and saw many people going out1.People use Richter scale to tell ______________A.where the earthquake takes placeB.when the earthquake takes placeC.how serious the earthquake isD.how long the earthquake lasts2.The recent biggest earthquake both in China and India killed around ___ peopleA.25,000B.45,000C.70,000D.95,0003.From the sentence “ There is nothing left between the sky and the earth any more” we learn that______________A.India is a large countryB.the Indian had nothing after the earthquakeC.there is no tall building in IndiaD.the earthquake in India was serious4.According to the passage, the City of Lahore is in __________________A.IndiaB.PakistanC.AmericaD.China