问题 阅读理解
阅读下面5段材料,从A到F选项中,找出与他们相对应的标题。
( )1. Hello! My name is Sam. I am from Canada.. I like painting. My parents teach me
Chinese. So I can speak a little Chinese. I want a Chinese pen friend.
( )2. In the future, Students will learn from their robot teachers. There will be no
classrooms in schools. Students will play and study in gardens. Students will go to school
only two or three times a week.
( )3. Do you like animals? I like them and I like pandas best. They are black and
white. They eat bamboo and then sleep for about 12 hours a day. I think they are very
lovely.
( )4. Do you have a pet (宠物) dog? I have one. Her name is Doudou. She has two big
eyes and a small nose. She is very clever. She often plays games with me.
( )5. There is a library near my school. You can see many books there. I like science,
so I like going there on weekends to read science books. There are always lots of people
there.
A. My pet dog, Doudou.
B. I want a pen friend.
C. A good library.
D. My favourite animal
E. My favourite city
F. School life in the future.
答案

1-5 BFDAC

填空题

(选做题)化学课上,一张《你们都来污染我》的图片,引起全班同学的深思。课后,同学们围绕“水污染与防治”的主题进行研究性学习。

(1)探究水污染的源头物质。

①生活中含磷洗涤剂的过量使用是导致水体富营养化的因素之一。洗涤剂中有一种成分的化学式为

Na5PxOy,若P的化合价为+a,则a和x、y的关系是:a=____________________。

②工业废水中含有铬、铅等重金属离子,对这类离子在水中的含量要严格控制的原因是__________________________________________。

③农药和化肥的任意使用会导致绿藻等水生植物在白天阳光充足的条件下迅速繁殖,晚间由于污染物耗氧和大量水生植物的_________作用,使水中的含氧量急剧下降,会造成鱼类等水生动物因缺氧而死亡。

(2)防治水污染的相关措施。目前,Buswell 和 Muller发明了一种治理水污染的新技术,其技术原理主要是在厌氧微生物作用下,使水中的有机体(CnHaOb)与水反应,生成二氧化碳气体和甲烷气体。该转化的化学方程式为: CnHaOb+[n―(a/4)―(b/2)]H2O ==[(n/2)―(a/8)+(b/4)]CO2 +[(n/2)+(a/8)―(b/4)]CH4

①请你写出以C6H10O5为代表物的厌氧过程的化学方程式:___________________________________。

②请你指出该种水污染处理技术的一个优点:______________________________________________。

③利用该技术的一个负面影响是:造成空气中的二氧化碳过高,而导致温室效应。如果要处理该技术产生的大量二氧化碳气体,有同学建议选用NaOH溶液,而不选择Ca(OH)2溶液,其原因是_____________________________________________________________。

单项选择题