设计师以y=2x²﹣4x+8的图形为灵感设计杯子如图所示，若AB=4，DE=3，则杯子的高CE=（　　）

如图，已知AC=BD，要使△ABC≌△DCB，在图形所给出的字母中，需添加一个条件是____ （从符合的条件中任选一个即可）

阅读下面短文，掌握其大意，并根据所给字母的提示，写出一个英语单词的完整、正确形式，使短文通顺。

    More and more A____ are going to work by bike. Do you know why more people are riding bikes to work? We can answer the question in d____ ways. First, bikes don't need gasoline(汽油)，so it takes little m____ to use them. S____  a bike doesn't need much space, so it is e____ to find a place for it. And to ride a bike is good for one's h____ .People often d____ their cars to offices or to shops in the past. But now people think riding bikes is a good way of d____ sports. That's w____ more Americans are now riding to work by bike, and they are leaving（把...留下）their o____ cars at home.

由人体中所含元素质量分数最大的非金属元素，与人体中所含元素质量分数最大的金属元素组成的化合物的化学式为（  ）