题目

The flowers ______ my mother, but my sister thought they were for her and took them. A. were intended for         B. intended for   C. intended to give     D. intended giving 答案：A运动员关节扭伤后，马上给他喷涂一种雾状的东西．那是什么呢？原来那是极易挥发的液态氯乙烷，用它作麻醉剂可使运动员的皮肤迅速冷却，在一段时间内失去疼痛感，这是由于氯乙烷（　　）A．汽化吸热B．升华吸热C．凝固放热D．熔化吸热