问题 完形填空
完形填空。
     Tina and Thomas Sjogren were the fourth and fifth people to reach the earth's three poles. Years ago, the
couple were   1   across the North Atlantic on their way to Europe. Tina looked out of her window and was
   2   by the vast amount of space in Greenland. "The sky outside the window burst into different   3  , and
auroras (极光) flew all around us. I   4   what it would be like to step down there and start walking   5  , all
alone in such a place." She thought, "If this is what Iceland and Greenland are like, how   6   then must the
Arctic be?" She turned to her husband,   7   him awake and said, "Honey, let's go to the Poles!"
     Tina's   8   would not be their first adventure. They had already climbed Mount Qomolangma. The pair
soon made a   9   to visit both the North and South Poles on skis, travelling  10 .
     On February 2, 2002, they reached the South Pole. Their journey  11  2 000 kilometres. After just 35 days
of recovery and preparation, they  12  again. "You are so  13  after the long expedition to the South Pole, so
you don't know if you could do  14  right away."
     On May 29, after travelling for the whole morning, as the couple watched with weak  15 , the numbers on
their GPS showed that their goal had  16  been achieved. They had made it.
     Without the  17  of dogs or supplies dropped from planes, it was only their strength and willpower that  18  
them to ski and swim their way. They got valuable experience but that did not come without a  19 . If you go
on an adventure, there's always the risk of something going wrong.  20 , you will learn from it.
( )1.A. flying         
( )2.A. frightened    
( )3.A. shapes        
( )4.A. remembered    
( )5.A. carefully   
( )6.A. cold          
( )7.A. shook       
( )8.A. idea          
( )9.A. suggestion    
( )10.A. non-stop      
( )11.A. covered       
( )12.A. broke down    
( )13.A. excited       
( )14.A. more          
( )15.A. torchlight    
( )16.A. surprisingly  
( )17.A. reward      
( )18.A. attracted     
( )19.A. price         
( )20.A. Therefore   
B. exploring   
B. bored        
B. colors      
B. wondered    
B. quickly      
B. bright       
B. knocked      
B. advice       
B. plan        
B. unsupported  
B. included     
B. settled down 
B. disappointed       
B. another     
B. sunlight    
B. luckily      
B. burden       
B. allowed      
B. success      
B. Instead     
C. swimming      
C. amazed       
C. sounds        
C. enjoyed      
C. aimlessly     
C. wonderful    
C kept          
C. order        
C. proposal      
C. unreturned   
C. lasted        
C. set out      
C. confused      
C. one          
C. breath        
C. accidentally        
C help          
C. taught       
C. mistake       
C. Otherwise    
D. sailing   
D. amused    
D. waves     
D. doubted   
D. freely    
D. terrible  
D. beat      
D. offer     
D. change    
D. unprepared           
D. crossed   
D. came back 
D. tired     
D. others    
D. eyesight  
D. eventually
D. company    
D. forced    
D. change     
D. However   
答案

1-5: ACBBD  6-10: CAABB  11-15: ACDBC  16-20: DCBAD

单项选择题
问答题

某品牌糖衣片补血剂,除去糖衣后显淡蓝绿色,主要成分是硫酸亚铁,不含其它铁的化合物.某研究性学习小组为测定该补血剂中硫酸亚铁的含量进行了以下探究:

请回答下列问题:

Ⅰ.(1)实验时用18.4mol•L-1的浓硫酸,配制100mL1mol•L-1H2SO4溶液,所需浓硫酸的体积为______.(计算结果精确到小数点后一位)

(2)下列操作中,容量瓶所具备的功能有______(填序号).

A.配制一定体积准确浓度的标准溶液B.长期贮存溶液

C.用来溶解固体溶质D.常用来代替量筒量取一定体积的液体

(3)在下列配制过程示意图中,有错误的是(填写序号)______.

(4)下列说法正确的______

A.洗涤烧杯2~3次,并将洗涤液移入容量瓶以减少误差

B.某同学将浓硫酸稀释后未冷却至室温便将溶液转移至容量瓶,所配溶液浓度会偏低

C.定容时仰视观察,所配溶液浓度会偏低

D.容量瓶使用前先要检查是否漏液,具体操作是向容量瓶中加蒸馏水,倒置不漏液即可

Ⅱ.(1)步骤②加入过量H2O2的目的:______.

(2)从红褐色的悬浊液到最后的称量,其过程中所需的基本操作为:

a.______,b.洗涤,c.灼烧,d.冷却

(3)若称得固体的质量为ag,则每片补血剂中含硫酸亚铁的质量为______.

Ⅲ.已知人体不能很好地吸收利用Fe3+,科学研究表明服用含硫酸亚铁的补血剂时,同时服用维生素C,以利于铁元素的吸收.试分析维生素C在这一过程中的作用是______.