题目

下列是反应2A + 3B = C + 4D在不同时刻测得的速率，其中最快的是     A．V(A)=0.6mol/L.s                                        B．V(B)=0.9mol/L.s     C．V(C)=0.4mol/L.s                                        D．V(D)=1.0mol/L.s 答案：C英译汉：They weren’t old then. They were young.____________________________________