问题 单项选择题

在大多数情况下,岩石的破坏形态为()。

A.剪切破坏

B.脆性破坏

C.挤压破坏

答案

参考答案:B

阅读理解

It was Christmas, and there was a big party in the house. Guests came and went, but the party went on. Then the bell rang. Several people shouted, "Come in!"and a small man opened the front door and came in. Nobody knew him. But the host went to meet him, and took him to the bar for a drink. The man sat there happily for an hour and a half and drank.Then suddenly he stopped and looked at the host. "Do you know," he said, "nobody invited me to this party. I don't know you, 'I don't know your wife, and I don't know any of your guests. My wife and I wanted to go out in our car, but one of your guests' cars was in front of our gate, so I came here to find him and my wife is waiting in our car for me to come back.

小题1:What’s the date that day ?

A. Monday . .B It’s December 25th .

C. It’s Novermber 25th   D. It’s January 1st

小题2:Which sentence is Not true about the party ?

A.All the guests stayed there until the party was over .

B.There were lots of people at the party .

C.There were some drinks at the party .

D.Not all the guests knew each other小题3:How long did the small man stay at the party ?

A. For an hour .

B.For half an hour .

C.For 90 minutes .

D.For a while小题4:Why did the small man stay at the party ?

A.He was the host’s neighbor .

B.He was a friend of the host’s .

C.He wanted to say “Have fun ” to the people at the party

D.He wanted to look for the person whose car was in front of his gate .小题5:The best title is ___.

A. A small Man

B.A Strange Guest

C.A Friendly Host

D.A funny Man

填空题

某化学兴趣小组为了从海水中获得淡水,并从海水中提取溴及制取含溴化合物,设计了一系列工艺流程和实验。

(1)蒸馏法是人类最早使用的淡化海水的方法,技术和工艺比较完备,但由于大量使用燃煤,因此能耗多。排污量大。为克服蒸馏法淡化海水的缺陷,请你对蒸馏法淡化海水的工艺提出一条改进意见:

_________________________________。

(2)空气吹出法是目前从海水中提取溴的常用方法,流程如下

a.反应②的离子方程式为______________________;

b.为了从反应③后的溶液中得到溴单质,向溶液中加入适量四氯化碳后,再进行___________操作,该操作使用的主要仪器是___________,最后进行蒸馏得到溴单质。

(3)用氯气生产溴酸钾的工艺流程如下

已知:溴酸钾(KBrO3)为白色晶体,是一种常用的氧化剂和分析试剂,加热到370℃分解为溴化钾和氧气。

“合成”过程所发生的反应中,氧化剂是___________,还原剂是___________;

“趁热过滤”过程中“趁热”的原因是___________;

溴酸钾具有毒性,食用少量即可引起呕吐和肾脏的损伤。然而美、日等国都允许在油炸薯片中添加一定量的溴酸钾,以改变薯片的口感。我国也曾允许其用作烘焙面包的添加剂,但已于2005年7月开始全面禁止在食品中使用溴酸钾。从化学原理分析推测,有的国家认为在油炸薯片中添加溴酸钾是“安全”的理由是(用化学方程式表示)______________________。而我国认为不安全的理由是______________________。