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A．Make posters.
B．Write a speech.
C．Answer questions.
D．Study chemistry.
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单项选择题
A．Your heat rate is lowered.B．It becomes harder to relax.C．You become too tired to sleep.D．Sleep rhythms are disrupted.
A．Your heat rate is lowered.
B．It becomes harder to relax.
C．You become too tired to sleep.
D．Sleep rhythms are disrupted.
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