题目

I have been looking for you everywhere. This is the _____ place in the world I would have expected to find you.    A. right                   B. last                          C. just                          D. only 答案：B上海医疗器械厂科研人员研制成不用电的化学冰箱，其原理是将一种物质溶解于水时的吸热作用作冷源，达到降温目的．这种物质可能是（ ）A．食盐B．氢氧化钠C．硝酸铵D．熟石灰