如图所示，AB=DB,∠ABD=∠CBE,请你添加一个适当的条件____，使△ABC≌△DBE（只需添加一个即可，不添加辅助线）.

下列有关物质的性质或应用的说法正确的是

已知不等式$\frac{x-2}{ax+b}>0$的解集为$\left(-1,2\right)$，m是二项式${\left(ax-\frac{b}{x^2}\right)}^6$的展开式的常数项，那么$\frac{ma}{a^7+2b^7}=$(      )

如图是科学家普利斯特利实验一个简图，该实验说明绿色植物通过光合作用吸收了   (    )

根据短文内容从方框中选择恰当的单词填空，使短文完整、通顺。有的需要变换形式，每词限用一次。

lose,   quick,   pity,   age,   gold,   player,   begin,   win

    Lin Dan is a world-famous badminton (羽毛球)player. He was born on 14th October 1983 in China. He____playing badminton when he was five years old. He played quite well and became the world's No.1 player at the____of 19. He helped China ____ the Thomas Cup and the Sudirman Cup. He ____in the men's singles final at the 2006 Asian Games in Doha. It was a great ____. But two years later, he made up for(弥补)the loss by winning the____medal at the Beijing Olympics. Lin Dan is a left-handed player and he is very____. He is the first badminton____to win a career grand slam(大满贯)：Olympic Games，World Championships，Asian Games，All England Open and all the top world events(比赛项目).