题目

Though my grandfather is in his eighties, he is still as _________ as a young man and hates sitting around doing nothing all day. A. enthusiastic        B. talkative       C. energetic       D. sensitive 答案：C1．反比例函数y=（2m-1）x${\;}^{{m}^{2}-2}$，在每个象限内，y随x的增大而增大，则m的值是-1．