A:高锰酸钾 海水 干冰 石墨
B:空气 稀有气体 二氧化锰 金刚石
C:自来水 锰酸钾 蒸馏水 液氧
D:食盐水 氢氧化钙 氧气 二氧化碳
读一读,选择正确的答案,将字母代号写入前面的括号内。
① Is he nine? ____ A. Yes, I am.
② Are you a boy?____ B. I'm a cow.
③ Are you two? ____ C. I'm four.
④ How old is your sister? ____ D. She is ten.
⑤ Who are you?____ E. Yes, he is.
The early history of the city of Rome involves Romulus and Remus,two orphan boys who,legend says,were raised by a she-wolf.The boys'mother had been murdered by an evil king and the two babies tossed into the river Tiber.When the wolf found them they had washed up on the shore.She perhaps took pity on the crying of the babies and,gently picking them up in her teeth,she carried them back to her cave and fed them on her milk.The boys grew bigger and stronger and,eventually,were found by a herdsman who took them home.He and his wife raised the boys like their own children.When they reached manhood they sought revenge on the king who had killed their mother and driven them from their home. They decided to build a city.Unfortunately,they argued over the appropriate site and Romulus killed his brother Remus.Romulus ruled this city — called Roma — for thirty-seven years. The city of Rome is one of the most popular tourist attractions in the world.If you travel there you can see a statue of the two baby boys feeding from their mother - the wolf.
①塑料②陶瓷③合成橡胶④水泥⑤合成纤维⑥玻璃.
一组正方形按如图所示的方式放置,其中顶点B1在y轴上,顶点C1、E1、E2、C2、E3、E4、C3…在x轴上,已知正方形A1B1C1D1的边长为1,∠B1C1O=60°,B1C1∥B2C2∥B3C3…则正方形A2016B2016C2016D2016的边长是( )