把式子按从大到小排列。

17－8   11－8   14－8   12－8    15－8

____＞____＞____＞____＞____

沙特阿拉伯人居住帐篷，身着宽大的袍子，过着游牧生活是因为气候（  ）

若幂函数f（x）=x^m﹣1在（0，+∞）上是减函数，则实数m的取值范围是____

    Some friends are playing hide-and-seek (捉迷藏) at Mr. Green’ home. They play in Mike’s room. It’s time for Lily to find her friends. Lily first finds Sally.Sally is behind the door. Then, Lily sees Bob. Bob is under the table. Mike is under the table, too. Now it’s time to find David and John. David’s hat is on the sofa. Is David under the sofa? No, he isn’t.John’s schoolbag is on the chair, but he isn’t there.“Where are they?”Lily thinks.Shh! Don’t let her know. They are under the bed!