如图，AD平分∠BAC，BD⊥AD，DE∥AC，求证：△BDE是等腰三角形．

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下列家用电器当中不是利用电流的热效应工作的是（    ）

要点: 1）小镇不大，离成都很近，但环境整洁，树木林立，河水清澈，空气清新。

     2）这里有4座大桥和一些现代化的建筑。

     3）有一个购物中心和2个大型超市，有运动场地，人们无论老少，都喜欢在这里活动。

    4）我最喜欢的地方是……,

    5）人们互相认识，非常友好，这里的确是个居住的好方。

My hometown

I'm glad to show you around my hometown.

B

    Today is Sunday. Mike and Peter 1 go to school. Listen! They are talking about the life 2 in the room.

    "3 will the world be like" asks Peter. "I think that the world will be a 4 place to live in. And we will 5 machines and robots at home. They will help us do lots of 6." says Mike.

    "The robots will help 7 cook dinner, clean the houses and 8 the old people. I think there will 9 a kind of medicine (药) and it can make me 10 more than 100 years ," Peter says.

    "What will you do then?" asks Mike.

    "Then I will take my great – grandchildren to the moon," says Peter. "The moon? I will go to the Mars (火星) with my wife ," says Mike.