单项选择题

A．Science courses.
B．Mathematics.
C．Liberal arts.
D．Literature.
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问答题
In the case of birds, when__________, the union is terminated, the pair separate, and each chooses a mate again.
单项选择题
A．Beginners have difficulty distinguishing the pronunciation of words.B．Advanced students remember words by their meaning.C．It is difficult to remember words that have the same meaning.D．It is difficult to remember words that sound alike.
A．Beginners have difficulty distinguishing the pronunciation of words.
B．Advanced students remember words by their meaning.
C．It is difficult to remember words that have the same meaning.
D．It is difficult to remember words that sound alike.
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