$\frac{5}{9}x=\frac{85}{100}$

x=____（用小数表示）

在四边形ABCD中，∠B=90°，AC=4，AB∥CD，DH垂直平分AC，点H为垂足，设AB=x，AD=y，则y关于x的函数关系用图象大致可以表示为（   ）

奥运主会场“鸟巢”的座席数是91000个，这个数用科学记数法表示为（   ）

根据短文内容和所给中文提示，写出空白处各单词的正确形式。每空限填一词。

    Jenny is an English girl. She is ____ (九) years old. Today is ____ (三月) 16th. It's her birthday. She wants to have a birthday ____（晚会）. It is ____ (在) seven this evening. But her uncle and aunt are____ (迟到的).She ____ (见面) five of her friends. They buy her a big birthday cake，two boxes of____ (牛奶), a basket of fruit, and ____ (一些) school things. Jenny wears a____ ( 绿色) sweater and brown trousers. She looks very nice. They all ____ (度过) a good time.

下图广告词说“科技以人为本”体现了以人为中心的理念。下列所举历史事件也反映这一理念的是（   ）