单项选择题

How many students were shot dead in-1997 in US schools()

A. 10
B. 9
C. 12
D. 22

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单项选择题
24()

A.serious 
B.apparent 
C.severe 
D.fatal
单项选择题
In line with the passage, if you don’t like to write a letter, it’s simply because ()

A. you are lazy enough
B. you are busy enough
C. you haven’t found the advantages of letters
D. you can’t afford too many letters
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