单项选择题

A．To put the homework on Don’’s desk.
B．To leave the master key for Don.
C．To give Don’’s students the next assignment.
D．To call Don at the end of the afternoon.
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单项选择题
According to the passage, the maximum intensity of sound coming from commercials______.
A．does not exceed that of programs
B．is greater than that of programs
C．varies over a large range than that of programs
D．is less than that of programs
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