题目

After a five-hour drive, they reached _____ they thought was the right place _____ they      had been dreaming of.    A. where; which            B. that; that      C. which; where      D. what; that 答案：D 解析: 略给出下列四个命题：①在空间中，垂直于同一条直线的两条直线平行；②若x2=1，则x=±1；③命题“两个相似的三角形面积相等”；④f（x）=|x-1|是偶函数其中真命题有______．