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【单选题】
The sun was shining as Kevin walked to the old bench(长凳) where he met Mike every afternoon after school. They were good friends and loved to play football. They didn't have enough money to buy a real football, but Mike had made a ball out of old socks covered with a piece of plastic. It wasn't beautiful, but it worked well. The two friends didn't stop kicking and running until very late. The next afternoon, Mike and Kevin met again at the old bench. Soon the home-made ball was spinning (旋转) across the grass as the boys laughed and shouted happily. The ball was stopped by a boy wearing a nice pair of sneakers(运动鞋). Kevin was upset wh en he saw it was Steven. The next morning, Kevin's mother gave him an envelope(信封). 'Your uncle sent you a birthday present,' she smiled. Kevin's eyes grew big when he saw the $100 bill. Later that day, a pair of new sneaker lay next to his chair, and in the corner, a real football. The next afternoon, Steven invited Kevin to play football on the field next to the library. Steven did not want Mike to join them only because Mike's sneakers were dirty and he was not good at football. When the game was over, Kevin and Steven walked past the old be nch where Mike was sitting. Steven picked up a stone and threw it at him. Kevin, holding his new football in his hands, walked on and did not look back. One afternoon, as Kevin walked past the old bench, he saw something lying under it. He looked closer and saw it was the home-made ball. Kevin was full of sorrow at the sight of his old home-made ball, and he let out a sad sigh(叹气). As his sadness turned to anger, he picked up his new football and kicked it into the air. Kevin kicked it so hard that it flew past the library and over the school gate. Then Kevin walked to the bench and picked up his home-made ball. Holding it in his hands, Kevin sat down and waited. 1. The best title for this passage is ______.
A.
A Home-Made Football
B.
Playing Football
C.
Two Close Friends
D.
A New Football
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【单选题】能正确表示下列反应的离子方程式为
A.
硫化亚铁溶于稀硝酸中:FeS+2H + =Fe 2 + + H 2 S↑
B.
NH 4 HCO 3 溶于过量的NaOH溶液中:HCO 3 - +OH - =CO 3 2 - +H 2 O
C.
将1 mol/L NaAlO 2 溶液和1.5 mol/L HCl溶液等体积互相均匀混合: 6AlO 2 - +9H + +3H 2 O=5Al(OH) 3 ↓+Al 3 +
D.
NaClO溶液与FeCl 2 溶液混合:Fe 2+ +2ClO - +2H 2 O=Fe(OH) 2 ↓+2HClO
【单选题】下列判断正确的是(  ) 第Ⅰ栏 第Ⅱ栏 判断 A 铁与稀硫酸反应可生成氢气 铁丝在氧气中点燃生成Fe 3 O 4 Ⅰ对;Ⅱ对 B Na 2 CO 3 溶液中,c(Na + )=2c(CO 3 2- ) 2 1 H的中子数和质子数相等 Ⅰ对;Ⅱ错 C Na 2 O 2 与H 2 O反应的化学方程式为Na 2 O 2 +H 2 O=2NaOH+O 2 ↑ 常温下可用铝罐贮存浓硝酸 Ⅰ对;Ⅱ对 D 用...
A.
A
B.
B
C.
C
D.
D
【简答题】(1)工业制硫酸铜的方法很多。 ①方法一、用浓硫酸与铜反应制取硫酸铜。该反应的化学方程式是____,此法的最大缺点是____。 ②方法二、用稀硫酸、铜和氧化铁制取硫酸铜,生产的主要过程如下图所示: 稀硫酸、铜和氧化铁反应的化学方程式是____;向混合溶液中通入热空气的反应的离子方程式是____;由滤液得到无水硫酸铜的实验操作是____。 (2)查阅资料知,在不同温度下Fe 2 O 3 被CO还原,...
【单选题】茶艺表演对表演者的仪容仪表要求“五不”,下面哪项不属于“五不”( )
A.
不戴手表
B.
不扎头发
C.
不浓妆艳抹
D.
不可涂有色指甲油
【单选题】关于余额试算平衡,下列表述中不正确的是( )
A.
全部账户的期初余额合计等于全部账户的期末余额合计
B.
全部账户的借方期初余额合计等于全部账户的贷方期初余额合计
C.
全部账户的贷方期初余额合计等于全部账户的借方期初余额合计
D.
全部账户的借方期末余额合计等于全部账户的贷方期末余额合计
【单选题】下列离子方程式中,正确的是[      ]
A.
石灰石与盐酸反应:CaCO 3 +2H + =Ca 2+ +CO 2 ↑+H 2 O
B.
氧化铁和稀硫酸反应:Fe 2 O 3 +6H + =2Fe 2+ +3H 2 O
C.
向Ba(OH) 2 溶液中滴加NaHSO 4 溶液至恰好为中性:Ba 2+ + OH - + H + + SO 4 2- = BaSO 4 ↓+ H 2 O
D.
NH 4 HCO 3 溶液与过量KOH浓溶液共热:NH 4 + + OH - NH 3 ↑+ H 2 O
【简答题】平键的截面尺寸应按轴的直径从键的标准中查取,键的长度可参照()从标准中选取。普通平键连接的工作面是();楔键连接的工作面是键的上下表面。
【单选题】能正确表示下列反应的离子方程式为(  )
A.
硫化亚铁溶于稀硝酸中:FeS+2H + ===Fe 2 + +H 2 S↑
B.
含等物质的量的KHCO 3 和Ba(OH) 2 溶液混合:HCO 3 — +Ba 2 + +OH - ===BaCO 3 ↓+H 2 O
C.
少量CO 2 通入硅酸钠溶液中:SiO 3 2— +2CO 2 +2H 2 O===H 2 SiO 3 ↓+2HCO 3 —
D.
硫化钠水溶液呈碱性:S 2 - +2H 2 O H 2 S+2OH -
【单选题】关于余额试算平衡,下列表述中不正确的是()
A.
全部账户的期初余额合计等于全部账户的期末余额合计
B.
全部账户的借方期初余额合计等于全部账户的货方期初余额合计
C.
全部账户的货方期初余额合计等于全部账户的借方期初余额合计
D.
全部账户的借方期末余额合计等于全部账户的贷方期末余额合计
【简答题】下表中,对第Ⅰ、Ⅱ栏判断都正确的是 第Ⅰ栏 第Ⅱ栏 判断 A. 铁与稀硫酸反应可生成氢气 铁丝在氧气中点燃生成Fe 3 O 4 Ⅰ对;Ⅱ对 B. Na 2 CO 3 溶液中,c(Na + )=2c(CO 3 2- ) 2 1 H原子的中子数和质子数相等 Ⅰ对;Ⅱ错 C. Na 2 O 2 与H 2 O反应的化学方程式为 Na 2 O 2 +H 2 O=2NaOH+O 2 ↑ 常温下可用铝罐贮存浓硝...
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