单项选择题

There is less crime now than there used to be. It seems that there is a ______ in the crime rate.

A．slope
B．incline
C．descent
D．decline
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单项选择题
He ______ his speech by calling for a vote of thanks for last year's president.
A．got up
B．wound up
C．stayed up
D．made up
单项选择题
All students ______ a loud laugh when professor Henry Mitchel told them the joke.
A．let off
B．let down
C．let out
D．let up
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