问题 填空题

将质量相等的A、B两块金属,分别放人溶质质量分数相同的足量稀盐酸中,生成氢气的质量(m)与反应时间(t)的关系如下图所示(产物A、B两种元素的化合价相同),分析下图,填空(“>”或“<”) 

(1)金属活动性A______B.

(2)相对原子质量A______B.

答案

从坐标中可以看出,横坐标表示时间,纵坐标表示氢气的质量,则斜率的大小表示反应的速度,B的斜率大,则B的反应速度快,故B比A活泼,价态相同的金属与足量的酸反应,相对原子质量大的产生氢气的质量小,从坐标中可以看出,B产生的氢气少,故B的相对原子质量大.

故答案为:<;<;

完形填空
完形填空。
     I agree with the saying that some people “see old memories as a chance to deal with the past and
unite past and present.” Many people are so    1   by things that happened in their past that they
are not able to focus on the   2   . For example, in the book Ceremony, the main character, Tayo,
cannot concentrate on the present because he can’t forget his troubled childhood and    3   continues
to relive things that happened during that time.
     However, past memories can help people to    4    in the present. A    5   example of people
learning from the past would be the Marshall Plan. After the   6   of World War II there were many
war-torn countries around the world in need of    7   assistance to help rebuild their countries, and
the United States would have to be the one to    8    that assistance. Many American politicians
thought it was    9   for the US government to spend money abroad on countries that would not be
able to repay it for a long time. However, George Marshall, a former US general, remembered how the
exact same    10   of "why should we spend money on war-torn nations that really owe us reparations
(赔款)?" had been used after World War I towards Germany. The   11    of assistance towards
Germany after World War I had caused a gigantic economic depression in Germany that had made the
Mark (German money) virtually    12   . The German people became so desperate that they started
   13   an extreme German nationalist named Adolf Hitler, who eventually started World War II.
Marshall knew that if the US did not   14   war-torn Germany and, especially, Japan, we could    15  
have a World War III on our hands.
( ) 1. A. shocked
( ) 2. A. memory
( ) 3. A. constantly
( ) 4. A. forget
( ) 5. A. personal
( ) 6. A. conclusion
( ) 7. A. medical
( ) 8. A. need   
( ) 9. A. reasonable
( )10. A. statement
( )11. A. intension
( )12. A. hopeless
( )13. A. refusing
( )14. A. stop   
( )15. A. similarly
B. troubled
B. situation
B. innocently
B. recover
B. scientific
B. decision
B. political
B. provide
B. necessary
B. argument
B. request
B. worthless
B. employing
B. warn
B. simply
C. punished
C. present   
C. ridiculously
C. enjoy   
C. historical
C. invasion
C. economic
C. find   
C. difficult
C. suggestion
C. influence
C. worldwide
C. supporting
C. resist
C. regularly
D. annoyed      
D. future        
D. rarely        
D. compare      
D. commercial    
D. extension    
D. lawful        
D. prevent      
D. foolish      
D. introduction  
D. lack          
D. valuable      
D. charging      
D. help          
D. unlikely      
填空题