问题 填空题

水是宝贵资源,研究生活和工业用水的处理有重要意义。请回答下列问题:

(1)已知水的电离平衡曲线如图所示。A、B、C三点水的电离平衡常数KA、KB、KC关系为    ,若从B点到D点,可采用的措施是        (填序号)。

a。加入少量盐酸   

b.加人少量碳酸钠

c.加人少量氢氧化钠

d.降低温度   

(2)饮用水中的NO3-主要来自于NH4+。已知在微生物的作用下,NH4+经过两步反应被氧化成NO3-。两步反应的能量变化示意图如下:

1 molNH4+全部被氧化成NO3-的热化学方程式为               

(3)某工厂用电解法除去废水中含有的Cr2O72-,总反应方程式为:

Cr2O72-+6Fe+17H2O+2H+    2Cr(OH)3↓+6Fe(OH)3↓+6H2↑,该电解反应的负极材料反应的电极式为       ,若有9 mol电子发生转移,则生成的cr(OH)3物质的量为              

(4)废水中的N、P元素是造成水体富营养化的主要因素,农药厂排放的废水中。常含有较多的NH4+和PO43-,其中一种方法是:在废水中加人镁矿工业废水,可以生成高品位的磷矿石——鸟粪石,反应的离子方程式为Mg2++NH4++PO43-   MgNH4PO4↓。该方法中需要控制污水的pH为7.5—10,若pH高于l0.7,鸟粪石产量会降;低,其原因可能是           

答案

阅读理解

Paris is the capital of France. Its subway is also very special. You can enjoy its culture when you are in this city. First you can see many people reading books in the subway. Whenever they are in the subway or at the station, there is always a book in the hand.

The subway station in Paris is not big, but each of them has its special facts. Some stations look like ships. Some stations have clothes, caps and shoes. And every station has a big advertisement picture. But many of them are for selling clothes and cosmetics(化妆品).

You can meet some beggars(乞丐) in the subway. But the beggars in the Paris subway are also very special. They often play the violin or guitar in the train. They don’t feel shy at all. Instead they think it is natural. After playing, they will go around the train and ask you to give them some money.

If you want to learn more about Paris, go to the subway and enjoy its culture by yourself.

小题1: What do many people usually do when they are in the subway?

A.Listen to music.

B.Beg some money.

C.Sell clothes and cosmetics. 

D.Read books.小题2: How do the beggars get money from people in the subway?

A.They often play the violin or guitar in the train.

B.They usually brush shoes for the passengers.

C.They often steal money from the shops.

D.They usually help the passengers carry suitcases.小题3: What’s the main idea of this passage?

A.Reading in the Paris subway.

B.The subway is a window of the Paris culture.

C.The beggars in the Paris subway usually have some skills.

D.Each of the subway station in Paris has its special facts.

阅读理解与欣赏

  皇甫规,字威明,安定朝那人也。祖父棱,度辽 * * 。父旗,扶风都尉。

  永和六年,西羌大寇三辅,围安定,征西 * * 马贤将诸郡兵击之,不能克。规虽在布衣,见贤不恤军事,审其必败,乃上书言状。寻而贤果为羌所没。郡将知规有兵略,乃命为功曹,使率甲士八百,与羌交战,斩首数级,贼遂退却。

  其年冬,征还拜议郎。论功当封。而中常侍徐璜.左悺欲从求货,数遣宾客就问功状,规终不答。璜等愤怒,陷以前事,下之于吏。官属欲赋敛请谢,规誓而不听,遂以余寇不绝,坐系廷尉,论输左校。诸公及太学生张凤等三百余人诣阙讼之。会赦,归家。 征拜度辽 * * ,至营数月,上书荐中郎将张奂以自代。曰:“臣闻人无常俗,而政有治乱;兵无强弱,而将有能否。伏见中郎将张奂,才略兼优,宜正元帅,以从众望。若犹谓愚臣宜充军事者,愿乞冗官,以为奂副。”朝廷从之,以奂代为度辽 * * ,规为使匈奴中郎将。

  规为人多意算,自以连在大位,欲退身避第,数上病,不见听。会友人上郡大守王旻丧还,规缟素越界,到下亭迎之。因令客密告并州刺史胡芳,言规擅远军营,公违禁宪,当急举奏。芳曰:“威明欲避第仕途,故激发我耳。吾当为朝廷爱才,何能申此子计邪!”遂无所问。及党事大起,天下名贤多见染逮。规自以西州豪杰,耻不得与。乃先自上曰:“臣前荐故大司农张奂,是附党也,又臣昔论输左校时,太学生张凤等上书讼臣,是为党人所附也。臣宜坐之。”朝廷知而不问,时人以为规贤。(节选自《后汉书·皇甫张段列传》)

   [注]①左校:汉代劳工营的名称。②与:这里指被牵连。

1.对下列句子中划线的词的解释,不正确的一项是[ ]

A.西羌大三辅,围安定——寇:贼寇

B.官属欲赋敛请——谢,谢罪

C.宜正天下名贤多见逮——染,牵连

D.臣宜之——坐,判罪

2.下列对文章的分析和概括不正确的一项是[ ]

A.皇甫规为人正直,因不搭理徐璜等人送礼的暗示,所以没被封侯,还被拘捕服苦役。

B.皇甫规荐中郎将张奂代替自己,荐贤让贤的精神可嘉。

C.因受党锢事件牵连,皇甫规主动上书,要求朝廷判他罪,这表现了勇于承责的精神。

D.本传记皇甫规,突出其贤能,有正面叙事表现,也有从他人着笔的侧面描写。

3.把文中画横线的句子翻译成现代汉语。

(1) 伏见中郎将张奂,才略兼优,宜正元帅,以从众望。

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(2) 规为人多意算,自以连在大位,欲退身避第,数上病,不见听。

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