_________(53)
A.foreword          
B.preface          
C.complement  
D. index

_________(52)
A.composes  
B.includes  
C.consists  
D.contains

_________(51)
A.explaining   
B. interpreting
C.suggesting 
D.presenting

_________(50)
A.events      
B.stories             
C.facts   
D.materials

_________(49)
A.assists 
B.pays      
C.helps          
D.works

_________(48)
A.antonyms    
B. closest  
C.opposite    
D.controversies

_________(47)
A.evidence                
B.roof     
C.examples    
D.cases

The word "revolutionized" is closest in meaning to _______.
A.quickly started 
B.gradually opened  
C. dramatically changed    
D.carefully examined

According to the passage, iron was NOT used for beams, columns, and girders prior to the early eighteenth century because _______.
 
A.all available iron was needed for other purposes
B. limited mining capability made iron too expensive
C.iron was considered too valuable for use in public buildings
D.the use of charcoal for refining ore produced poor quality iron

Part II. In about 140 words, write a paragraph about why is it important to protect our environment? What should we do to fulfill this task?
A.
B.
C.
D.