单项选择题

What do the results of a recent sleep study show

A．People who sleep enough are good at math.
B．Sleep is important for learning.
C．Too much sleep is good for your health.
D．Adults need more sleep than kids.

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单项选择题

What is the best title for the text

A．Too Much Sleep
B．It's Homework Time
C．Sleep to Succeed
D．Math Problems

单项选择题

The underlined word boost” in the last paragraph means

A．watch
B．stop
C．lower
D．increase