题干

已知△ABC的三个内角分别是∠A、∠B、∠C,若∠A=30°,∠C=2∠B,则∠B=____ °.

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同类题2

结合所学知识,阅读下列材料并回答问题。
材料一  人生来是而且始终是自由的,在权利方面是平等的;自由、财产、安全和反抗压迫是天赋而不可剥夺的人权……
材料二 凡未经议会同意,以国王权威停止法律或停止法律实施之越权力,为非法权力。议会议员之选举应是自由的……
材料三 谴责了英国国王对殖民地的暴政,宣布一切人生而平等,人们有生存、自由和追求幸福等权利。同时宣告北美13个殖民地脱离英国而独立……
材料四 “年满21岁的所有法国人都享有民事权利。”
“所有权是对物有绝对使用、收益及处分的权利。”
“契约一经合法成立,当事人必须按照约定切实履行……不得任意修改和废除。”
——节选自《拿破仑法典》
请回答:
(1)当今英国的“国王统而不治、首相领导的议会掌握最高权力”这一政治现象源于上述哪一材料?结合所学知识从材料分析判断,英国确立了怎样的政治体制? 
(2)美国的自由女神像右手高擎火炬,左手握着一块铭板,上面刻有日期:1776年7月4日。你认为上述哪一材料内容符合刻在铭板的上文件内容?该文件的名称是什么?
(3)材料一颁布于哪次资产阶级革命中?材料中的要求反映了哪一阶级的利益?
(4)材料四的内容体现了《拿破仑法典》的哪些立法原则?
(5)以上材料内容的共同点有哪些?

同类题5

阅读理解、

    I'm part of the Roots & Shoots program founded by Dr. Jane Goodall. The program is intended to make and promote positive changes in the world. As Dr. Goodall says, “What you do makes a difference, and you have to decide what kind of difference you want to make.”

    In Bulgaria, where I live, homeless dogs are everywhere. Many people here turn a blind eye to them. But I cannot ignore the life of a street dog whenever I see one wandering in the street, looking for something to eat. That's why I'm no longer a food waster. When I see wasted food, I always think of a hungry dog climbing to garbage bins, searching for food that people have thrown there. When eating in a restaurant, I'm not afraid to take leftover food to feed stray cats or dogs.

    A week ago, I saw a homeless dog around the garbage bins. Immediately I knelt down, spoke to her softly and ran my hands over her. I could see that she had had puppies. I couldn't imagine how she could have been able to care for them. Hours earlier, I'd bagged up a plate of leftover fish. As I unwrapped it, she wagged her tail and sniffed at it. She ate all the fish in no time.

    It's sad, isn't it? I can't understand why many of us waste so much and think little of it. These homeless animals have taught me that food is precious. Even when I don't have leftovers with me, I'll take the time to get something from the grocery store to feed them.

    I know my power is small, so I hope that next time you see wasted food, do turn it into worthy food. You have the power to save a life!