选出最符合句意的一个单词.

1 Carelessness is often the (   ) of fires.
a.errors 
b.cause  
c.threat  
d.consequence 
 
2 In the elementary school there is often a prize for good (   ).
a.conduct  
b.defect  
c.servant  
d.threat
  
3 He could not (   ) green color from red one.
a.measure  
b.symbolize  
c.exhibit  
d.differentiate   

4 The doctor (   ) him that his child would recover from the illness.
a.refused  
b.assisted  
c.contrasted  
d.assured  
 
5 (   ) was with us and we won easily in the baseball game.
a.Defect  
b.Luck  
c.Vision  
d.Justice 
 
6 Heat caused the (   ) of steam from water.
a.mixture
b.scarcity  
c.formation  
d.profession   
7 The thoughtless children (   ) the speech of the new boy.
a.mocked  
b.sucked  
c.owned  
d.owed   

8 A dog (   ) a keen sense of smell.
a.embraces  
b.symbolizes  
c.behaves  
d.possesses
  
9 I (   ) it to you that I am still alive.
a.reign  
b.hire  
c.owe  
d.own   

10 A dove (   ) peace, whereas a hawk (   ) war.
a.symbolizes  
b.contrasts  
c.assures  
d.differentiates    

答案：
b a d d b
c a d c a