单项选择题

A．Amino acid.
B．Body’s natural rhythm.
C．Exhaustion.
D．Difficulty going to sleep.
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单项选择题
A．Milk products.B．Soft drinks.C．Sleeping pills.D．Fruit juice.
A．Milk products.
B．Soft drinks.
C．Sleeping pills.
D．Fruit juice.
单项选择题
A．Most students felt disappointed and unhappy.B．The class was generally nervous and quiet.C．Many students were too excited to speak.D．A few students behaved especially well.
A．Most students felt disappointed and unhappy.
B．The class was generally nervous and quiet.
C．Many students were too excited to speak.
D．A few students behaved especially well.
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