题目

室温下，将1 mol的CuSO4·5H2O(s)溶于水会使溶液温度降低，热效应为ΔH1，将1 mol的CuSO4(s)溶于水会使溶液温度升高，热效应为ΔH2；CuSO4·5H2O受热分解的化学方程式为CuSO4·5H2O(s)CuSO4(s)＋5H2O(l)，热效应为ΔH3，则下列判断正确的是 A．ΔH2＞ΔH3  B．ΔH1＜ΔH3  C．ΔH1＋ΔH3＝ΔH2  D．ΔH1＋ΔH2＞ΔH3 答案：AThe difficulty lies ________ the fact that we are short of money. [　　] A．atB．onC．inD．to