题目

Rescuers had to _____ the search because of worsening weather conditions.    A. call off             B. take off             C. come off           D. cut off    答案：A 解析: 略已知a>0且a≠1，f(logax)＝(x－)． (1)求f(x)； (2)判断f(x)的单调性和奇偶性； (3)对于f(x)，当x∈(－1,1)时，有f(1－m)＋f(1－2m)<0，求m的取值范围．