单项选择题

A．It increased the students’’ blood pressure.
B．It increased some students’’ energy level.
C．It released a natural painkiller in some students’’ bodies.
D．It improved the students’’ ability to play musical instrument s.
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单项选择题
What is the passage mainly about
A．Science teachers to ban testing harmful to animals.
B．Teachers’’ policy change in experiment on animals.
C．The new policies of banning harmful experiments to animals.
D．The importance of prohibiting harmful experiments on animals.
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