问题 选择题

在商朝的历史上,使其统治区域不断扩展,成为当时世界上的文明大国过程中,做出突出贡献的王是[ ]

A.桀

B.汤

C.纣

D.盘庚

答案

答案:D

阅读理解

在第1至5题中,有五人正在选择合适的活动。阅读下面六项活动的介绍 (D、E和F),为每一位选出

符合各人需求的最佳活动。选项中有一项是多余选项。

( )1. Sam who came from America two months ago is now teaching oral English in English in Dongfang

Middle school. He can only understand and speak a few Chinese words. He is adventurous and sporting and

would like to trv something new to kill his time on Sunday.

( )2. Julie coming from Australia is an exchange student in Shaoguan University. She majors in Chinese

Art and likes Chinese culture very much. But now what worries her most is her overweight because of the

delicious Chinese food. So she'd like to find someone to guide her to keep fit.

( )3. Mrs. Yang is very busy with her job in the company as well as the housework at home. As a result

of the long-term strain, she often feels oppressed, restless and tired. So she hopes to do some suitable

exercise to lessen and relax such disturbances of physical and mental system at weekends.

( )4. Some of Ted's Net friends will go to Beijing to visit him around Christmas. How excited he is! He

plans to take them to some places of interest and entertain them Now he is looking through China Daily to

find something fit for them.

( )5. Benny has just graduated from No.16 Middle School. Luckily, he has been admitted into South

China Agricultural University. Since childhood, he has been interested in trees, flowers, birds and animals.

Now in the summer holiday, he is eager to find something exciting and something he is keen on to do.

A. Flashlight Adventure: Put on your warm clothes, bring a flashlight and a pair of glasses, and come for a

night walk along the Great Valley. A guide willlead the tour. Many of the animals you'll see on this trip can

only be seen at night. The guide will tell you about the lives of the animals you see. Cost: 50 yuan Time:8:00-

10:30 pm, every Saturday. Tel: 83321239.

B. Taichi with English Narration: An experienced Taichi teacher, about 38, teaches the basic 24 movements,

pushing-hands and self-defense techniques. It is fit for the beginners and intermediate level. Time:10:00-12:00

am, every Sunday. Place: Bamboo Garden Hotel, Jiu Gulou Street. Fee: 60 yuan each time. Tel: 65287750.

C. Chinese Ink & Painting Class: It is to learn the techniques of painting a bird, flower, or lady with brushes.

The Chinese philosophy and culture will also be included. Tools and materials are provided Time: 7:00-9:00

pm, every Friday. Fee: 50 yuan each week. Tel: 38876788.

D. Great Wall Party: The latest Great Wall Party is sponsored by the Club and Elektrobeat and held at

Jinshanling. Local DJ Mark, as well as guests Slab from Australia, Usami and Bobby from Hong Kong will

spin the sounds. All drinks are priced at 20 yuan Ticket: 200 yuan, including bus ride there and back plus

entrance fee to the Great Wall. Time: 8:00 pm- 2: 00 am, Dec. 20-30. Pre-sale tickets are available at Public

Space. Tel: 64160759.

E. Healthy Diet Program: The 8-week program helps you discover how to be healthy, slim and beautiful! It

is unlike other diet regimes in that it focuses on proper nutrition first and weight loss second. It offers control

over stomach and continuing hunger with a calorie dense diet allowing 1 700 to 2 000 calories a day. Call to

get more information: 75763457.

F. Lotus Yoga: The word Yoga means combination and harmony, whose true sense refers to the perfect unity

of a person's body and mind. It is a way to maintain highly natural and relaxed state and purify your body and

mind, a way to lessen the tiredness in the waist and back and keep fit while heightening the body's ability to

keep coordinated and balanced. Booking for any course, please access http://www.Lotusyoga.cn.

实验题

农业生产中使用最广泛的磷肥是过磷酸钙,其主要成分是         (填化学式);在实际使用中,其不能与草木灰混合施用的原因是(用离子方程式表示)           。目前常用的湿法磷肥生产工艺是用硫酸分解磷矿石(主要成分为Ca5(PO4)3F),这样处理的主要目的是                  

该生产工艺的有关反应为:

2Ca5(PO4)3F+7H2SO4=Ca3(PO4)2+4H3PO4+7CaSO4+2HF

Ca3(PO4)2+4H3PO4=3Ca(H2PO4)2

生成的氟化氢会和磷矿中带入的二氧化硅反应生成SiF4,若直接排放到空气中,将严重污染环境。某磷肥厂改进工艺,在吸收塔中将SiF4经水吸收后转化为氟硅酸(H2SiF6)溶液和硅胶(SiO2),实现氟的循环使用和硅胶的合理利用,以减小对环境的污染,同时创造经济效益。工艺流程如下:

(1)写出吸收塔中反应的化学方程式____        

(2)该工艺流程中,设计两个吸收塔的目的是                    

(3)氟硅酸与磷酸钙和水反应可生成磷酸二氢钙,原理是:

2H2SiF6+Ca3(PO4)2+4H2O=2CaSiF6·2H20 +Ca(H2PO4)2

CaSiF6·2H2O+2H2O=CaF2·SiO2·2H2O+4HF

4HF+Ca3(PO4)2=2CaF2+Ca(H2PO4)2

若利用氟硅酸与磷酸钙和水反应代替硫酸与磷酸钙反应生产Ca(H2PO4)2,理论上lkg氟硅酸可替代_____kg硫酸。

(4)分离得到的硅胶中因含有H2SiF6而称含氟硅胶,含氟硅胶中SiO2易溶于沸腾的氟化铵溶液,得到(NH4)2SiF6溶液,此反应为可逆反应,加入氨水后,二氧化硅重新析出。写出SiO2与氟化铵反应的化学方程式______                   __。