题干

如图所示,已知在三角形纸片ABC中,BC=3,AB=6,∠BCA=90°.在AC上取一点E,以BE为折痕,使AB的一部分与BC重合,A与BC延长线上的点D重合,则DE的长度为(  )

A:6

B:3

C:23

D:3

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答案(点此获取答案解析)

C

同类题1

阅读材料,回答下列要求。

材料一:雅典国家权力的运行中存在着民主权力的制约,……梭伦开始赋予公民大会以立法权,陪审法庭以司法权,五百人会议以行政权,并使之互相制约。……雅典国家机构权力虽有分工,但权限的划分比较笼统而且权力互相交错。立法、司法、行政不是平行关系,而是行政、司法在立法机关监督下的分权。行政、司法都要对立法机关负责,但它又不是一元政治,没有一个至高无上的权力机构,即使国家最高权力机关公民大会也要受到一定的权力制约。

——摘编自蒋云芳、胡长林《雅典民主政治的特征及对西方民主的影响》

材料二:在美国,立法权由国会掌握。参议院代表美国各州,由各州选出,每州两名,共100名;众议院代表美国人民,按在全国由相同人口划分的选区选举选出,共435名.国会拥有最高立法权,修改宪法权,对外宣战权,监督财政权等四大国家权力。行政权由总统掌握.美国总统是国家元首,政府首脑和陆海空三军总司令,他对选民直接负责,国会对他的政治行为不得干涉.总统以向国会提出"国情咨文"的方式行使立法倡议权。

——摘编自许鑫《分权制衡思想演变及对西方政治制度构建的影响》

材料三:第二条帝国依据本宪法规定在联邦领土内行使立法权,帝国法律应高于各邦法律。

第十一条联邦的主席职位属于普鲁士国王,普鲁士国王享有德意志皇帝的尊称。

第十二条联邦议会与帝国议会的召集、开会、延会、闭会之权属于皇帝。

第十五条联邦议会的主席职务及其事务的领导权属于由皇帝任命的帝国宰相。

第二十条帝国议会由秘密投票的普遍和直接选举产生。

——摘编自蒋相泽《世界通史资料选辑·近代部分》

同类题4

阅读理解

    There are many differences between country life and city life in many ways. One person even does different things in the two places.

    Julia lived in the countryside, but one year she decided to visit the capital city to do some shopping and to see the sights. She stayed at a hotel near the central market. She had seldom been to the city before, and was very excited about what she would find.

    On the first morning of her visit, as she walked from the hotel to the market, she passed a beggar(乞丐). He was holding up a notice, which said, “Blind from birth. Please give generously(慷慨地).”

    Julia felt sorry for the blind beggar and she bent down and put a dollar coin into his bowl. “Thank you.” he said.

    The same thing happened again the following day.

    On the third day, however, Julia did not have a dollar coin. She had only fifty cents, so she dropped this into the beggar's bowl.

    “What have I done wrong?” the beggar said, “Why are you so stingy today? ”

    Julia was very surprised at what the beggar said. “How do you know I haven't given you a dollar?” she said, “If you're blind you can't know what coin I put into your bowl.”

    “Ah, ” explained the beggar, “The truth is that I'm not blind. I'm just looking after this place for the regular beggar while he's on holiday.”

    “On holiday?” Julia said, “And what exactly does your blind friend do on holiday?”

    “He goes into the countryside,” the man said, “and takes photographs. He's a very good photographer.”