题目

阅读下面短文，根据其内容写一篇60词左右的内容概要。 A 15­year­old boy planned to put aball covered with petrol into his mouth and set it on fire. He would film thedangerous action and put it on YouTube. And, he hoped to become famous on theInternet. But things didn't go the way he imagined. His clothing caught fire, andhe was rushed to the hospital with serious burns on his body. YouTube hosts millions ofvideos of people attempting dangerous actions. Many of them are by kids andyoung adults. Some experts say that by hosting these videos, YouTube encouragesyoung viewers要使Mg(OH)2与Al(OH)3的混合物中的Mg(OH)2溶解，而Al(OH)3不溶，可加入的物质是（）A.盐酸B.NaOH溶液C.NH4Cl溶液D.氨水