[2010六级]-12月六级完形与改错专项练习(12).doc

[2010六级] 12月六级完形与改错专项练习(12)

Passage 12
Oral health care is, these days, a big, boom                    1.            
business. According to Ralph Nader, American                 2.            
spend some $5 billion on dental care each year. Yet,
although the tremendous amounts of money, time              3.            
and energy giving over to oral health, dental                   4.           
literature indicates that about half the population in
this country has lost all of his natural teeth by age              5.            
65. Nearly half of all people over age 20 wear a bridge
or denture, and more than 30 percent have
complete upper and lower dentures. By age 50, one
out of every two persons have gum disease.                   6.            
The dental profession blames neglectful
Americans them¬selves. About half the population, it
claims, fails in visit the dentist regularly and some 30                7.            
million never did. Critics, on the other hand slam                    8.            
the profession. It can be conservatively esti¬mated
that at least 15 percent of United States dentists are                 9.            
incompetent, honest, or both, says a former                        10.            
Pennsylvania Commissioner of Insurance. Some have
set the figure as high as 50 percent.

1．boom －> booming
2．American－>Americans
3．although－>despite
4．giving－>given 
5．his －> its
6．have －> has
7．fails in visit －> fails to visit
8．never did－> never do
9．United States－> the United States
10．incompetent，honest，or both－> incompetent, dishonest, or both