单项选择题

A: This is like the coolest CD I’ve ever heard. 　　B:_________I’m trying to concentrate on my work.

A．Cut it short.
B．Keep it down.
C．Turn it over.
D．Bring it up.
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单项选择题
What is true about the Google online questionnaire
A．It was based on a survey of its employees.
B．It focuses on background questions.
C．It was designed by some mathematicians
D．It has been filled out by 100，000 people
单项选择题
The percentage of the 9th grade smokers in 2009 was （）

A．23.2
B．25.2
C．31.2
D．33.4
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