如图，在四边形ABCD中，对角线AC，BD相交于点O，且AO=CO，BO=DO，在不添加任何辅助线的前提下，要想该四边形成为矩形，只需再加上一个条件是_1（填上你认为正确的一个答案即可）_刷题宝

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如图，在四边形ABCD中，对角线AC，BD相交于点O，且AO=CO，BO=DO，在不添加任何辅助线的前提下，要想该四边形成为矩形，只需再加上一个条件是____（填上你认为正确的一个答案即可）

上一题下一题 0.0难度选择题更新时间:2017-08-18 03:54:40

答案(点此获取答案解析）

∠DAB=90°

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下列有关金属的说法正确的是( )

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—Jane played the piano pretty well at the party last night.

—_______

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2016年度诺贝尔物理学奖揭晓，授予三位获奖人，以奖励他们“在拓扑相变以及拓扑材料方面的理论发现”。物理学中的拓扑物态理论指某个拓扑材料的细节发生了细小的变化，但是其性质、功能依然保持。材料体现了（）

①思维和存在具有同一性 ②思维和存在相互依赖

③真理是客观的有条件的 ④追求真理需要一个过程

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Mr.White is traveling around the country in the car．One evening he is driving along a road and looking for a small hotel when he sees an old man at the side of the road．He stops his car and says to the old man，“l want to go to the Baiyun Hotel．Do you know it?”

“Yes．”the old man answers，“l'1l show you the way．”

He gets into Mr．White's car，and they drive for about twelve miles．When they come to a small house，the old man says，“Stop here．”

Mr．White stops and looks at the house，“But this is not fl hotel．”he says to the old man．

“N0。”the old man answers，“this is my house．And now I'll show you the way to the Baiyun Hotel．Turn around and go back nine miles．Then you'll see the Baiyun Hotel on the left．”

同类题5

通读下面的短文，掌握其大意，然后从各题所给的A、B、C、D三个选项中选出一个最佳答案。

Mike: Hi, Cindy! How are you?

Cindy: Hello, Mike. I am fine, thanks.

Mike: Cindy, I 1 a photo. Is it yours?

Cindy: Yes. It is 2. Thank you, Mike.

Mike: You are welcome. 3 they in this picture?

Cindy: They are my grandparents.

Mike:4 this man your father?

Cindy: No. He is my father's brother. He is my 5.

Mike: The girl is nice. Is 6 your sister?

Cindy: No. She is my friend, Lucy. She is in China now.

Mike: What is her 7? I want to know something 8China.

Cindy: It is lucy226@qq.com. You can 9 Lucy at 536-85472, too.

Mike: Thanks. Have a 10 day!

Cindy: You, too.

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