问题 填空题

写出符合下列要求的物质(或主要成分)的化学式.

(1)常温常压下密度最小的气体是______;

(2)通过呼吸引起人体中毒的氧化物是______;

(3)含三种元素的汽车燃料是______;

(4)能产生“温室效应”的气体单质是______;

(5)炼铁时用来除矿石中二氧化硅的原料的主要成分是______.

答案

(1)常温常压下密度最小的气体是氢气,其化学式为:H2

(2)一氧化碳能与血液中的血红蛋白结合,是通过呼吸引起人体中毒的氧化物,其化学式为:CO.

(3)乙醇是含三种元素的汽车燃料,其化学式为:C2H5OH.

(4)碳燃烧生成二氧化碳,是能产生“温室效应”的气体单质,其化学式为:C.

(5)炼铁时用来除矿石中二氧化硅的原料的物质是石灰石,其主要成分是碳酸钙,其化学式为:CaCO3

故答案为:(1)H2;(2)CO;(3)C2H5OH;(4)C;(5)CaCO3

判断题
写作题

阅读下面的一则通讯稿,然后按照要求写一篇150词左右的英语短文。

Recently many advisers have called for reforms of the English language testing system to make it more effective in developing actual language ability.

"Currently, the English testing system in China puts too much pressure on students to get high marks and ignores the development of their comprehensive(综合的)language abilities," they said.

"Some changes in the evaluation procedures of English examinations are necessary for the sound development of the national English education system," others added.

[写作内容]

假设你班最近要进行一次英语主题班会,就上述文章中谈及的话题进行讨论,请你准备一篇发言稿,以下是发言稿的内容(开头与结尾已经写好):

1. 以约30个词概括和分析上述话题的主要内容;

2. 以约120个词就这一话题发表自己的看法,并包括如下要点:

(1) 你是否赞成通讯稿中人们的观点。

(2) 至少呈现三条理由来支撑自己的观点。

(3) 对于“How to develop comprehensive language ability”,提出你认为最重要的一条途径。

[写作要求]

1.作文中可以参照阅读材料的内容,但不得直接抄用原文中的句子;

2.文中不能出现真实姓名和学校名称。

Dear classmates,

____________________________________________________________________________________________

______________________________________________________________

Personally, ____________________________________________________________________________________________

____________________________________________________________________________________________

_____________________________________________________

As to the development of comprehensive language abilities, __________________________

____________________________________________________________________________________________

______________________________________________________________

That’s all. I appreciate your attention.