问题 填空题

佛山市等珠江三角洲城市将建立压缩天然气管道输送网络。

 (1)天然气代替燃煤是防止空气污染的措施之一。请写出天然气燃烧的化学方程式:____________________________________。

 (2)在某种氧化物作用下,可使汽车尾气中CO和NO反应,并转化为两种气体。其中一种可以参与植物的光合作用,另一种是空气中含量最多的气体,这两种气体是(写化学式) ________和             

 (3)氢气是理想的清洁能源,目前被认为最好的储氢方法是金属储氢法。氢化钠(NaH)是一种常用的生氢剂,遇水后放出H2并生成氢氧化钠。试写出该反应的化学方程式: ___________________ 。

(4)2005年8月广东出现“油荒”现象,世界石油价格飙升,寻找替代能源具有重要的现实意义。请写出能代替汽油来驱动汽车、具有开发前景的二种能源:             、      

答案

(1)CH4 + 2O2CO2 + 2H2O

(2)CO2;N2

(3)NaH + H2O===NaOH + H2↑ 

(4)酒精;氢气(其他符合题意的也可)

阅读理解

阅读理解。

     This August, we'll welcome guests from all over the world. Some of them follow their own special

cultural traditions. It's important for us to know about them.

     ●In many countries, such as Thailand, India and Malaysia, people believe that the left hand is unclean.

So, it's not proper to use one's left hand to hold food, touch others or pass objects. Doing so may offend

certain guests.

     ●Some Westerners may be offended if you touch them or their personal things--- even by accident.

If this happens, say sorry politely.

     ●Some elderly Westerners may be offended if you try to help them without their agreement.

     ●People think numbers can be lucky or unlucky. Some Westerners avoid the number 13 because

they believe it is unlucky.

     ●Muslims(穆斯林) do not eat pork, and words like pigs are not considered proper.  

     ●People from Brazil, Italy and Pakistan do not give handkerchiefs(手帕)as gifts. They believe a

handkerchief is closely connected with unhappy feelings.

     ●Wine is not sent as a gift in many parts of western and middle Asia, where most Muslims live.

1. Indians don’t hold food with the left hand because they consider it______.

A. unclean    

B. useless    

C. valueless

D. unimportant

2. The word “offend” in the second paragraph(段落)might mean ______.

A. honor    

B. help    

C. hate

D. hurt

3. Muslims do not ______.

A. send gifts    

B. eat pork  

C. drink milk

D. Use handkerchiefs

4. Which of the following is TRUE according to the passage?

A. People from Pakistan like to send handkerchiefs as gifts.

B. All the elderly people in the west like being helped by others.

C. The number 13 is thought to be unlucky by some Westerners.

D. Westerners do not mind their personal things being touched.

5. What does the passage mainly talk about?

A. Lucky numbers.      

B. Traditional food.

C. Culture differences.  

D. Hands and handkerchiefs.

单项选择题