单项选择题

A．Teacher and student.
B．Boss and clerk.
C．Lawyer and client.
D．Two colleagues.
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单项选择题
A．The beginning of the United States.B．The American Civil War.C．The 19th century.D．It’’s unclear.
A．The beginning of the United States.
B．The American Civil War.
C．The 19th century.
D．It’’s unclear.
单项选择题
What does the passage say about asteroids and meteoroids
A．They are heavenly bodies different in composition.
B．They are heavenly bodies similar in nature.
C．There are more asteroids than meteoroids.
D．Asteroids are more mysterious than meteoroids.
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