题目

Linda hurt her legs badly in the accident, so she could _______ stand up.               A. really             B. probably               C. especially         D. hardly 答案：D不论x取何值，下列分式的分母一定不为0的是（　　）A．x2+1x2B．x2|x+1|C．|x+1|x+1D．|x-1|x2+1