以环境的不稳性和复杂性为二维尺度时，可以有以下几种不确定性环境（） A.低度不确定

学校买来48套桌椅，每张桌子120元，每把椅子40元，学校买课桌椅一共用去多少元？（两种方法解）

材料分析题：

材料一 “秦始皇接受李斯的建议，发布焚书令，规定除政府外，民间只可收藏医药、占卜和种植等书，其余一律集中焚毁。他又把暗中诽谤他的儒生400多人，全部活埋。”

材料二 “凡不在六艺之科、孔子之术者，皆绝其道，勿使并用。邪辟之说灭息，然后统纪可一而法度可明，民知所从矣。”

阅读材料后回答：

（1）材料一中反映的内容在历史上被称为什么？

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（2）秦始皇这样做的目的是什么？有什么危害？

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（3）材料二中董仲舒向汉武帝提出什么建议？

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（4）汉武帝这样做的目的是什么？ 

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（5）试比较两位皇帝做法的异同点？

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若某电台教育频道的频率为6.0×10⁶Hz，电磁波在真空中的传播速度__________（填“大于”、“等于”或“小于”）光在真空中的传播速度，其速度大小为__________m/s．

阅读理解。

     Childhood was an illusion (错觉) and the illusion was this: everything was bigger. No, Imean everything,

not just houses and shops and grown-ups, but colors and flowers and journeys, especially journeys which

seemed endless. "Are we there yet, Daddy?"

     Funfairs (游乐场) were huge things that spread for miles around you with noise and lights and exciting

danger. Rainy days at home when you were ill seemed to last for ever. Being a grown-up yourself was an

unthinkable distant possibility. Every sound was louder, every game was grander, every pain unbearable.

     As I've grown old, life has become smaller. Tastes have bulled. Surprises have lurned into shocks. Days

go by unnoticed. How can I regain childhood when it was an illusion? 

     I have only one repeatable and wonderful way and even in this way I can regain only part of that larger

world. I can play upon the stage like a child and make the crowd laugh and laugh with them, sometimes

helplessly like a child, and then, even though I'm a sixty-one-year-old man, I can almost catch the colors and

sounds and stillness of those bigger years when I was little.

1. How does the author feel about his childhood? [ ]

A. It was endless.

B. It was unpleasant.

C. He is glad that it is over.

D. He misses it as a grown-up

2. The author thinks that everything was bigger in childhood because ____. [ ]

A. children could not make proper judgments

B. children were curious and eager about life

C. things appeared really big in children's eyes

D. to grow up seemed so long for children

3. The world seems to have become smaller to the author because ____. [ ]

A. life is disappointing

B. time goes by too fast

C. he has had too many surprises

D. foods no longer taste delicious

4. The author enjoys playing on the stage so as to ____. [ ]

A. act like a child

B. live an unusual life

C. make the crowd laugh

D. regain his childhood

甲(男)搭乘乙(女)的出租车，至偏僻处甲掏出刀子抢劫乙现金若干、手机一部。甲拔了车钥匙，并威胁乙道：“不准报警，我下车走一段路后把钥匙丢下，你自己来找。”甲下车后，乙用备用钥匙开动汽车追上甲，并用车撞甲且高声呼救。甲被撞倒后爬起来再跑，乙又驱车撞甲致其受伤(轻伤)，在群众帮助下将甲抓获。对乙的行为评断正确的是哪一选项( )

A．事后防卫，构成故意犯罪

B．特殊防卫，不认为防卫过当

C．防卫过当，应当负刑事责任

D．正当防卫，不应负刑事责任