若函数f（x）=$\left\{\begin{array}{c}{x}^2+ax-2,x\le 1\\ -a^x,x>1\end{array}\right.$（a＞0，且a≠1）在（0，+∞）上是增函数，则a的范围是（　　）

选词填空。

    Deng Feng is my friend．He is____and interested in music．He usually gets up at 6：00 in the morning and then he does some____in the park．He likes to listen to____music When exercising．Before going to bed，he listens to some____of light music．Sometimes he'd like to enjoy traditional Chinese music．He____it's a good way to relax．Some day,he will study music and be a musician．

“阿里山的姑娘美如水，阿里山的少年壮如牛。“这首歌唱的是（    ）