单项选择题

A．Studying for a test.
B．Visiting a close fiend of theirs.
C．A class presentation they’re preparing.
D．A television program the man is watching.
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单项选择题
A．One of his classes finished early.B．His books were ten days overdue.C．He wanted to get some studying done.D．The library had a special display on the Industrial Revolution.
A．One of his classes finished early.
B．His books were ten days overdue.
C．He wanted to get some studying done.
D．The library had a special display on the Industrial Revolution.
填空题
The brain stem sends electrical impulses throughout the brain about every ______.
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