题目

下图中，化合物A,  B，G，M, L, J 均由两种元素组成，其中A是一种无色液体， G是极易溶于水的常见气体，L分子中的电子数为18(L的相对分子量不超过34)。反应⑤是工业上制X的主要反应之一，化合物H具有强的氧化性，可由常见卤素气体与苛性钾溶液在常温下反应而制得。N的溶液呈浅绿色。(注；有些反应的水也略去) 请按要求填空： （1）写出下列物质的化学式： L：                   ，X：                   。 （2）反应④的离子方 come   watch  shine   fast   its          Light travels at a speed(速度) which is about a million times(76)_______     than that of sound in one second, about 300,000 kilometers while sound travels only 340 meters. You can get some idea of this difference by(77)_____       the start of a running match. If you stand far away from the starter(发令员) , you can see smoke(78)_______      from his gun before the sound reaches your ears. The fast speed of light produces some strange facts. The nearest star is so far away that light which you can see from it tonight started to travel to you four years ago at a speed of nearly two million kilometers every minute. The light from some of tonight’s started on (79)_________journey towards you even before you were born. So, if we want to be honest, we can’t say, “The stars are shining brightly tonight.” We have to say, “The stars look nice. They were(80)______        four years ago but their light has just reached our earth.”