单项选择题

A．It increased the students’ white blood cell.
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．The man should go and enjoy the performance.B．The man could play games on the Internet.C．The man should go to bed early.D．The man can enjoy the performance without going out.
A．The man should go and enjoy the performance.
B．The man could play games on the Internet.
C．The man should go to bed early.
D．The man can enjoy the performance without going out.
单项选择题
A．It has numerous traits in common with the spotted owl.B．Its population is increasing in recent years.C．It may not survive without special efforts of conservationists.D．Its role in the chain of evolution has not yet been examined.
A．It has numerous traits in common with the spotted owl.
B．Its population is increasing in recent years.
C．It may not survive without special efforts of conservationists.
D．Its role in the chain of evolution has not yet been examined.
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