问题 单项选择题

饶河古称()

A.番水

B.信江

C.余汗水

D.昌江

答案

参考答案:A

完形填空
完形填空。
     I grew up poor-living in the housing projects (住房) with six brothers, three sisters, a varying assortment
(各式各样东西的混合) of foster kids (养子), my father, and a wonderful mother, Scarlette Hunley. We had
little money and few worldly goods, but plenty of love and attention. I was   1   and energetic. I understood
that no matter how poor a person was, he could still   2   a dream.
     My dream was   3  . By the time I was sixteen, I could crush a baseball, and hit anything that moved on
the baseball field. I was also   4  : My high school Coach Jarvis, who not only believed in me, but taught me
how to believe in myself. He   5   me the difference between having a dream and showing conviction (信念).
One particular incident with Coach Jarvis changed my life forever.
     It was the summer between my junior and senior years, and a friend   6   me for a summer job. This meant
a chance for money in my pocket-cash for dates with girls, certainly, money for a new bike and new clothes,
and the   7   of savings for a house for my mother. The prospect of a summer job was attractive and interesting,
and l wanted to jump at the opportunity. Then I realized I would have to   8   summer baseball to handle the
work schedule, and that meant I would have to tell Coach Jarvis I wouldn't be playing.
     When I told Coach Jarvis, he was   9   as I expected him to be. "You have your whole life to work," he said.
"Your  10  days are limited. You can't afford to waste them."
     I stood before him with my head hanging, trying to think of the words that would explain to him why my
dream of buying my mom a house and having money in my pocket was worth facing his  11  to me.
     "How much are you going to make at this job, son?" He demanded.
     "3.5 dollars an hour." I replied.
     "Well," he asked, "Is $3.5 an hour the price of a dream?"
     That question, the plainness of it, laid here for me the difference between wanting something right now and
having a goal. I delicated myself to sports that summer and with the year I was hired by the Pittsburgh Pirates
to play baseball, and was  12  a $20,000 contract. I signed with the Denver Broncos in 1998 for $1.7 million,
and bought my mother the house of my dreams.
( )1. A. happy      
( )2. A. live       
( )3. A. athletics  
( )4. A. right      
( )5. A. persuaded  
( )6. A. sent       
( )7. A. aim        
( )8. A. give in    
( )9. A. disappointed
( )10. A. living    
( )11. A. sadness   
( )12. A. paid      
B. polite   
B. afford   
B. music    
B. popular  
B. taught   
B. advised  
B. idea     
B. give up  
B. mad      
B. playing     
B. regret   
B. got      
C. shy        
C. make       
C. business   
C. lucky      
C. brought    
C. gave       
C. start      
C. give away  
C. frightened 
C. working    
C. hopelessness  
C. offered    
D. honest         
D. need           
D. money          
D. confident      
D. asked          
D. recommended      
D. purpose        
D. give off       
D. shameful       
D. learning       
D. disappointment 
D. presented      
问答题

氰化物有剧毒,冶金工业会产生大量含氰化物的废水,其中氰化物以CN-等形式存在于废水中.某化学小组同学对含氰化物废水处理进行研究.

I.查阅资料:含氰化物的废水破坏性处理方法.

利用强氧化剂将氰化物氧化为无毒物质,如以TiO2为催化剂用NaClO将CN-离子氧化成CNO-(CN-和CNO-中N元素均为-3价),CNO-在酸性条件下继续与NaClO反应生成N2、CO2、Cl2等.

II.实验验证:破坏性处理CN-的效果.

化学兴趣小组的同学在密闭系统中用如图装置进行实验,以测定CN-被处理的百分率,实验步骤如下:

步骤1:取一定量废水进行加热蒸发、浓缩.

步骤2:取浓缩后含CN-离子的废水与过量NaClO溶液的混合液共200mL(设其中CN-的浓度为0.2mol•L-1)倒入甲中,塞上橡皮塞.

步骤3:______.

步骤4:打开甲上的橡皮塞和活塞,使甲中溶液全部放入乙中,关闭活塞.

步骤5:打开活塞K,通一段时间N2,关闭活塞K.

步骤6:实验完成后测定干燥管I(含碱石灰)的质量m2(实验前干燥管I(含碱石灰)的质量m1

回答下列问题:

(1)在破坏性处理方法中,在酸性条件下NaClO和CNO-反应的离子方程式______.

(2)完成步骤3______.

(3)丙装置中的试剂是______,丁装置的目的是______.

(4)干燥管Ⅱ的作用是______.

(5)请简要说明实验中通入N2的目的是______.

(6)若干燥管Ⅰ中碱石灰增重1.408g,则该实验中测得CN-被处理的百分率为______.