单项选择题

A．An examination of fanners in northern Japan.
B．Tests given on a thousand old people.
C．Examining the brain volumes of different people.
D．Using computer technology.
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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．Practical experience and ability.B．Years of patient practice.C．A degree certificate.D．A set of course of instructions.
A．Practical experience and ability.
B．Years of patient practice.
C．A degree certificate.
D．A set of course of instructions.
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