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Traffic lights are very important for us. I think you know this. But do you know how they were born? Garrett A. Morgan was the father of traffic lights. He was an American. His family was very poor. He left school at the age of 14. He was clever. He always looked for better ways to do things. And he liked to make new things. At that time, every American wanted to have a car. The streets were full of cars. The traffic was really bad. “Why not put three lights at each corner ? They should be red , green , and yellow,” Morgan said , “ Let them tell cars to go or stop.” He made a timer (定时器)to change the lights. So we have traffic lights today . 小题1:Today can help buses or cars to go regularly in cities . A.Americans B.Traffic lights C.Chinese D.policemen 小题2:Garrett A.Morgan was the father of traffic lights. He came from. A. Canada   B. England C. America      D. Japan 小题3:Why could Garrett A.Morgan invent traffic lights? Because. A. he always looked for better ways to do things B. his family was very poor C. he wanted to have a car D. He was clever 小题4:What did Garrett A.Morgan do when he was 14 years old ? A.He studied at school. B. He put three lights in the street. C. He was away from school. D. The streets were full of cars. 小题5:What color are the traffic lights ? They are . A.green and white B.red and yellow C.red , green and yellow. D.red and green
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【简答题】关于摩擦力,下列说法中正确的是 [ ] A. 相互压紧的粗糙物体间一定存在摩擦力 B. 运动的物体一定受到摩擦力 C. 静止的物体一定受到摩擦力 D. 相互紧压的粗糙物体之间有相对滑动时,才受滑动摩擦力
【单选题】截止到2018年,我国逾( )亿贫困人口实现脱贫,占同期全球减贫人口的( )以上。
A.
5;60%;
B.
6;70%;
C.
7;70%;
D.
8;80%;
【多选题】下面哪些是正确的迎客方式:( )
A.
如果客人进门时,办公人员正在接打电话或正在与其他的客人交谈,应用眼神、点头、手势等表示请进的肢体语言表达自己已看到对方,并请对方先就座稍候。
B.
如果手头正在处理紧急事情,可以先告诉对方:“对不起,我手头有点紧急事情必须马上处理,请您稍候。”
C.
遇有重要客人来访,接待人员需要到单位大门口或车站、机场、码头迎接,且应提前到达。
D.
不做任何迎客动作,不闻不问或面无表情。
【单选题】下列属于4~5岁幼儿心理发展特征的是( )
A.
爱模仿
B.
个性初具锥形
C.
抽象思维开始萌芽
D.
开始接受任务
【单选题】擦法是在保持足够压力下,作快速度
A.
单方向直线运动
B.
双方向直线往返运动
C.
弧形运动
D.
圆周运动
E.
垂直向下运动
【单选题】用钙指示剂在钙镁离子的混合液中直接滴定钙离子,溶液的 pH 必须达到 ( )。
A.
14
B.
12
C.
10
D.
8
【单选题】关于摩擦力,下列说法中正确的是 [ ]
A.
相互压紧的粗糙物体间一定存在摩擦力
B.
运动的物体一定受到摩擦力
C.
静止的物体一定受到摩擦力
D.
相互紧压的粗糙物体之间有相对滑动时,才受滑动摩擦力
【单选题】“月光美人”的产区主要在( )省。
A.
湖南
B.
云南
C.
福建
D.
四川
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【简答题】读中国的疆域示意图,完成下列各题: 材料一:“迎风飘扬,胜利歌声多么响亮”伴着雄壮的《歌唱祖国》的歌声,庆祝建国60周年的仪式拉开了序幕,其中的重头戏就是阅兵式,既有来自我们主要邻国的来宾,又有来自三大舰队的受阅部队,盛况空前。 材料二:我国位置和邻国地图 (1)填出图中下列字母所代表的我国陆上邻国的名称:A ____ B ___ C ____ D ____ E _______ (2)填出...
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