计算：﹣45×（$\frac{1}{9}$+1$\frac{1}{3}$﹣0.4）

位于南太平洋的珊瑚海最深处达到九点一七四千米．____

阅读短文，掌握大意，然后从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。

    A little sports shop is near my house. It sells (卖) many good things for  1 . At the shop, we can buy soccer balls,  2 , basketballs and so on. Today my  3 and I go to the4  to buy a tennis racket. There are a lot of 5 . And they have different  6   . I think every racket  7  very nice. My sister chooses (选择) a black one, because black is her favorite8  . You know, my sister is a big sports fan. She has a great sports    9   at home-five soccer balls, four basketballs and many tennis balls. She really likes   10  sports.

图示意我国某水库库区蓄水前后对库区周围地区降水量的影响。读图完成。

如图是草原生态系，请回答：