诗人席慕容在诗集《无怨的青春》中说:“在水中放进一块小小的明矾就能沉淀出所有的渣

题型:填空题

问题:

诗人席慕容在诗集《无怨的青春》中说:“在水中放进一块小小的明矾就能沉淀出所有的渣滓.”已知明矾的化学式为KAl(SO42•12H2O,研究表明,Al3+在人体内会阻止小肠壁对磷的吸收,使血液和其它组织内磷的含量减少,造成记忆力减退,免疫功能下降,被世界卫生组织确定为食品污染源之一.请回答下列问题:

(1)用明矾净化水的过程属于______变化(填“化学”或“物理”).

(2)为降低铝的摄入量,请你提出两条生活中可行的建议:______;______.

考点:物理变化和化学变化的特征和判别化学元素和人体健康
题型:填空题

I、今有①CH3COOH、②HCl、③H2SO4三种溶液,选择序号填空:

A.①>②>③ B.①<②<③ C.①=②=③ D.①=③>②

E.①>②=③ F.①<②=③ G.①=②<③ H.①=②>③

(1)当它们的物质的量浓度相同时,其pH的关系是__________。

(2)中和等体积、等物质的量浓度的烧碱溶液,需同物质的量浓度的三种酸溶液的体积关系为______。

(3)当它们pH相同、体积相同时,分别加入足量锌,相同状况下产生气体体积关系为__________。

II、在相同温度下,物质的量浓度相同的下列溶液:

a、HNO3 b、CH3COOH c、NH4NO3 d、NaOH

(4)溶液的pH由小到大的顺序是__________ ﹝填序号﹞。

(5)水的电离程度由大到小的关系是__________﹝填序号﹞。

题型:填空题
任务型读写(共10小题; 每小题1分,满分10分)
阅读下列短文,根据所读内容在文章后的表格中填入恰当得单词。 注意:表格中每个空格中只填入一个单词。
Some people believe that greed and selfishness has become the basis of modern society, and we should return to the old traditions of family and community then we will have a better life. To what extend do you agree or disagree with the above opinion?
In this fast-paced world, many values are undergoing major changes. While people traditionally prioritize caring, sharing and generosity in life and work, modern people seem to be
more self-absorbed or self-concerned.
Modern people act selfishly to survive the harsh competition of life. They say that it is a jungle out there. To survive, you have to fight with whatever means that come handy. Obviously greedy and selfishness go perfectly well with such ideas. In a company, employees do everything they can to get better pay and higher position, even at the cost of colleagues. We are in any way advocating any selfish conduct. It is just that people are pressured to act in a certain way due to outside influences
. In spite of common practice, it is hard to conclude that modern society is built on greed and selfishness, both of which are not newly invented vocabulary. In ancient times people also did greedy and selfish things though such behaviors were more condemned then. But we can not ignore the fact that people in the past lived a relatively more isolated life and faced less pressure compared with their modern counterparts.
Are we happier to share with others and be generous to them? There is no fixed answer, either. Some people take great pleasure helping and giving to others while others feel happy doing the opposite. But I personally think that people should not be too selfish. Caring for others can actually encourage the development of a mutually beneficial relationship.
In conclusion, modern people appear to be more self-centered than those in the past due to strong outside pressure. However, we should encourage people to know the importance of being caring and generous and to build a mutually beneficially relationship with others.
Are Modern People Becoming More Selfish
Main comparisons
Contexts
   __1__ are changing
In the past people put caring, sharing  and generosity in the first ____2____.
Nowadays, people seem to be more ____3____about themselves.
___4___are changing too.
People in the past appeared to be modest and self-effacing(谦让的).
People may strive to achieve their own _5___ at the price of their coworkers.
The author’s  understanding
___6____ for the changes in author’s eyes
Fierce __7___ and great __8___on modern people may be responsible for the changes.
The author’s ___9____towards topic
A relationship which can ___10___ two sides should be established.
 
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《耕地占补平衡考核办法》规定,( )每年对全国耕地占补平衡考核工作作出部署。

A.建设部

B.国土资源部

C.农业部

D.矿产管理部

题型:填空题

下表是“馒头在口腔内的消化”的探究方法:

10分钟后取出三只试管,各滴加2滴碘液,摇匀。请你分析:

(1)加碘液后变蓝色的试管编号是___________,消化效果最好的是________号试管。

(2)人的口腔能对淀粉发挥较好的效果,因为口腔里有_____________,能磨碎食物,口腔里还有舌头,能搅拌食物;同时口腔周围的唾液腺能分泌__________,并通过导管流入口腔,对淀粉进行消化。

题型:填空题

某公司进口红酒一批。海关于2009年1月12日(星期一)填发税款缴款书。该公司于2月11日(星期三)缴纳税款(注:1月25-31日为法定节假日)。税款滞纳天数为( )。

A.3天

B.10天

C.11天

D.15天

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