单项选择题

A．They cannot sleep well.
B．They cannot eat well.
C．They tend to bite each other.
D．They tend to reproduce more.
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单项选择题
A．Since Friday.B．Since Saturday.C．Since Sunday.D．Since Monday.
A．Since Friday.
B．Since Saturday.
C．Since Sunday.
D．Since Monday.
单项选择题
A．About seven million.B．Nearly half of the American population.C．25% of American people.D．We don’t know exactly from the passage.
A．About seven million.
B．Nearly half of the American population.
C．25% of American people.
D．We don’t know exactly from the passage.
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