题目

下列有关实验操作、现象、解释或结论都正确的是（） 选项实验操作现象解释或结论 A充分吸收了Na2SiO3 饱和溶液的小木条，沥干后放在酒精灯外焰加热小木条不燃烧Na2SiO3 可作防火剂 B将H2 在充满Cl2 的集气瓶中燃烧集气瓶口上方有白烟生成H2、Cl2 化合生成HCl C将SO2 通入酸性高锰酸钾溶液中溶液褪色SO2 具有漂白性 D用分别蘸有浓盐酸和浓氨水的玻璃棒相互靠近冒白烟NH3 具有还原性 A . A B . B C . C D . DAt two o’clock a bank robber stole in.“This is a holdup,” the man said loudly. He took a gun from under his jacket, pointing to George.“Hand it over!” George reached into his money-box and took all the bills from the top part-close to six thousand dollars. The robber took them and turned to leave. Then, while everyone watched the robber, George calmly lifted the top part of the money-box, took bills from the bottom part and put them into his own pocket secretly. The door was shut and the bank robber was gone. George fainted（晕倒）. As soon as he was safely behind his bedroom door, George counted the money. He had eight thousand dollars. He was very happy. The next morning, while the others were examining the bank's records, George was called into Mr Burrow's office and was introduced to Mr. Carruthers, who used to be president of the bank. “Good morning, George, I was sorry to give you a hard time yesterday, but with all the banks being robbed these days I thought it would be a good idea to prove that our little bank can be robbed too. I have retired（退休）, but I’m always thinking of our bank. That's why I played my little game yesterday, just to keep everyone on his toes（趾）. Now, I have put the money back in your money-box all six thousand.”1.This passage tells us ______.A.a serious caseB.one part of a playC.a humorous storyD.a meaningful story2.Which of the following do you think is true?A.George wanted to protect the money for the bank.B.George had been thinking of taking money away.C.This bank had been robbed several times.D.Nobody knew the bank would be robbed that day.3.Why was George called into Mr. Burrow’s office?A.His stealing money was disclosed.B.Mr. Burrow wanted to say sorry to him.C.Mr. Carruthers wanted to explain the whole thing to him.D.Mr. Burrow wanted to tell him the money had been put back.4.In this article “to keep everyone on his toes” means “______”.A.to make everyone work hardB.to keep everyone standing straightC.to make everyone do a kind of exerciseD.to keep everyone paying attention to the coming danger5.Which sentence can be used to end the story?A.George turned cold with fear.B.George turned red with anger.C.George was pleased with the end.D.George was disappointed with the end.