问题 选择题

某同学发现了一株花色奇特的杜鹃花,于是采摘了部分枝条,打算用扦插的方式进行繁殖。下列关于该实验的叙述,不正确的是[ ]

A.采摘的枝条中,芽较多、较嫩的枝条相对来说更容易生根

B.生长素促进生根的效果与生长素处理枝条的时间长短成正比

C.生长素类似物有一定的毒性,实验结束后应妥善处理废液

D.可发现两个不同的生长素浓度,促进根生长的效果相同

答案

答案:B

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完形填空。
     Today the problem of environment has become more and more serious. Every day, every hour, the air,
forests, soil, oceans and fresh    1     are becoming dirtier and dirtier. There are two     2     for the problem: the excessive (过度) use of natural resources and pouring a lot of     3     waste in the course of production. 
     Yet, man    4     great progress in environmental protection. Scientists and inventors are trying to
develop    5      engines for automobiles. Governments of many countries have made    6     to protect the
natural resources. More and more people have realized the importance of environmental protection and are doing what they can to protect our surroundings.
     Still more ways     7     to solve the problem. People should be educated in       8      modern methods to protect the environment and learn to make clever use of recycling our natural resources. The government of all       9       should take ways to fight against pollution _    10   _ protecting the environment is not only
protecting our home but also the civilization (文明) of the humankind.
( ) 1. A. water      
( ) 2. A. ways      
( ) 3. A. pollution  
( ) 4. A. makes      
( ) 5. A. cleaner    
( ) 6. A. ways      
( ) 7. A. should take
( ) 8. A. using      
( ) 9. A. schools    
( ) 10. A. so        
B. air      
B. reasons  
B. polluted
B. made    
B. dirtier  
B. laws    
B. taking  
B. taking  
B. cities  
B. because  
C. food          
C. things        
C. polluting      
C.  has made      
C. Worse          
C. rules          
C. should be taken
C. having        
C. countries      
C. because of    
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