单项选择题

A．It increased the students’ white blood cell count.
B．It increased some students’ energy level.
C．It improved the students’ ability to play musical instruments.
D．It released a natural painkiller in some students’ bodies.
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单项选择题
A．Deliver the package in person.B．Pick up the package at the post office.C．Find out the hours the post office is open.D．Ask to have the package delivered to his home.
A．Deliver the package in person.
B．Pick up the package at the post office.
C．Find out the hours the post office is open.
D．Ask to have the package delivered to his home.
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