单项选择题

A．Less than 30 minutes.
B．From 30 to 45 minutes.
C．At least 45 minutes.
D．More than 30 minutes.
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单项选择题
A．They play against each other in order to get the best score.B．They want to get some exercises.C．They want to win a prize.D．They want to keep a score.
A．They play against each other in order to get the best score.
B．They want to get some exercises.
C．They want to win a prize.
D．They want to keep a score.
单项选择题
A．Once a week.B．Twice a week.C．Three times a week.D．Four times a week.
A．Once a week.
B．Twice a week.
C．Three times a week.
D．Four times a week.
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