题干

如图1,点O是正方形ABCD两对角线的交点,分别延长OD到点G,OC到点E,使OG=2OD,OE=2OC,然后以OG、OE为邻边作正方形OEFG,连接AG,DE.

上一题 下一题 0.0难度 选择题 更新时间:2019-10-05 10:09:04

答案(点此获取答案解析)

同类题3

阅读下面短文,根据其内容,从方框中选择适当的单词填在标有题号的空白处,使语意通顺、完整.(每空一词,切不可重复使用)

moving    direction    fall      hands      where    protect     yourself

against    as        up     possible     easily     them  thing   ground

 What should you do if you are in a crowd(人群)? The first and most important ____   is to make yourself clear where you are and where the exits are. No matter ____  you are, make sure you always know how to get out and to be safe.

 Make yourself know the type of  ____  you are standing on. Wet or uneven(不平坦的)ground can cause you to ____  down in a crowd of moving people.

 If you find ____   in the middle of a moving crowd, you must be careful. Do not walk ____  the moving direction and do not stop or sit down, because you could get trampled (踩踏)  ____ Instead, move in the same ____  of the crowd. Keep your____  up by your chest(胸部)to protect your chest. If you fall down, get up quickly, If you can't get  ____  , ask someone to pull you back up. If you have kids, lift  ____  up.

 If you fall and cannot get up, keep on  ____   in the same direction of the crowd. If that is not  ____   , then cover your head with your arms.

 Try to get away from hard things in a crowd. If you're pushed against them, ____   a result, you may be hurt badly.

 We should learn to ____  ourselves. Stay away from the crowd.

Remember: Whatever you do, safety is first!