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.
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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.
单项选择题
A．Before finishing schoolB．Between school and university.C．During her university course.D．After finishing university.
A．Before finishing school
B．Between school and university.
C．During her university course.
D．After finishing university.
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