题目

Is it true ________ the rain stops, it will be as hot as in the summer here? A. when            B. that when C. whenever         D. that 答案：B  that引导的是主语从句。when the rain stops在主语从句中是时间状语从句。  设函数f（x）=xm+ax的导函数f′（x）=2x+1，则∫12f（-x）dx的值等于（　　）A．56B．12C．23D．16