[题目]下列关于硅的说法中.不正确的是( )A．硅是非金属元素.它的晶体单质是灰黑色有金属光泽的固体B．硅的导电性能介于导体和绝缘体之间.是良好的半导体材料C．硅的化学性质不活泼.常温下不与任何物质反应D．加热到一定温度时.硅能与氯气.氧气等非金属反应题目和参考答案——青夏教育精英家教网—

题目内容

【题目】下列关于硅的说法中，不正确的是( )

A．硅是非金属元素，它的晶体单质是灰黑色有金属光泽的固体

B．硅的导电性能介于导体和绝缘体之间，是良好的半导体材料

C．硅的化学性质不活泼，常温下不与任何物质反应

D．加热到一定温度时，硅能与氯气、氧气等非金属反应

【答案】C

【解析】硅虽然外形像金属(有金属光泽)，但实际上属于非金属；硅既有金属性，又有非金属性，其导电性也介于导体和绝缘体之间，是良好的半导体材料。硅的化学性质不活泼(尤其是在常温下)，但常温下仍能与氟气、氢氟酸和NaOH溶液等发生反应，加热至一定温度时，硅能与氯气、氧气等非金属发生反应。

练习册系列答案

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（﹨）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1．每处错误及其修改均仅限一词；

Agony Aunt,

I’m quite annoyed these days. It started from the last Wednesday. I lost a 100-yuan note in the classroom this morning. I asked my deskmate causally if he had seen it. To my great surprise, he burst into angry. “What do you mean by that?” asked him. “I am poor, so I’m never a thief!” I immediately explained, but he simply doesn’t listen. I knew he was too angry at the moment, so I decided to wait a day and two till he cooled down. But he didn’t give me time: the next day, he went to the teacher and asked never be my deakmate no more. Help me, Agony Aunt. How should I do?

Yours,

Li Hua

【题目】短文改错(共10小题；每小题l分，满分10分)

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。

删除：把多余的词用斜线(＼)划掉。

修改：在错的词下画一横线，并在该词下面写出修改后的词。

注意：

1. 每处错误及其修改均仅限一词；

2. 只允许修改10处，多者(从第11处起)不计分。

An old scientist recently made several tests with different animals to find out which was clever than other animals. In one test the old scientist put a monkey in the room where there was several boxes. Some boxes were inside other boxes. One small box have some food in it. The scientist wanted to watch the monkey and to find out how long it will take the monkey to find the food. The scientist left the room. He waited for a few minutes outside the door. Then he got down his knees and put his eyes to the keyhole. What did he see? To her surprise, he found himself looking at the eye of the monkey. The monkey was on the other side of the door and looks at the scientist through the keyhole.

【题目】短文改错

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处，每处错误仅涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。

删除：把多余的词用斜线(＼)划掉。

修改：在错的词下画一横线，并在该词下面写出修改后的词。

注意：

1. 每处错误及其修改均仅限一词；

2. 只允许修改10处，多者(从第11处起)不计分。

Dear Diary,

Here I am in the middle of a city,350 miles far away from our farmhouse. Do you want to know why we move last week? Dad lost her job, and as Mom explained, ＂He is lucky to find other one.＂ His new job meant I had to say goodbye to my classmate, my school and just everything else I love in the world. To make things bad, now I have to share a room to my younger sister, Maggie. Tomorrow is first day of school. I am very tiring, but I know I’ll never fall asleep. Good night, or remember, you is my only souvenir(纪念品) of my past life and my only friend.