单项选择题

A．that
B．which
C．when
D．where
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单项选择题
How many Serbian immigrants and Serbian-Americans live in the Chicago area
A．About 5,000.
B．More than 50,000.
C．At least 500,000.
D．Less than 50,000.
单项选择题
Which one is the proof showing that dolphins are breaking the family group
A．They attack people.
B．The fight among themselves.
C．They mate with their family members.
D．They are rude and cruel.
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