半导体工业用石英砂做原料,通过三个重要反应生产单质硅: ①SiO2(s)+2C(s) = Si(s)+2CO(g) △H = +682.44 kJ/mol (石英砂) (粗硅) ②Si(s)+2Cl2(g) = SiCl4(g) △H = -657.01kJ/mol (粗硅) ③SiCl4(g)+2Mg(s) = 2MgCl2(s)+Si(s) △H = -625.63 kJ/mol (纯硅) 生产1.00kg纯硅的总反应热为 A.+2.43×104kJ B.-2.35×104kJ C.-2.23×104kJ D.-2.14×104kJ根据汉语填出英语单词。1.This _______(吉他) is mine.2.Ann is good at playing the ______.(笛子)3.I can play the _________(钢琴).4.That is a ________(鼓).5.We will go to a __________(音乐会).