单项选择题

A．They are an unexpected and unnatural disaster.
B．They are an irreversible chemical production in waters.
C．They are an unpreventable pollution to waters.
D．They are an explosive, wild growth of aquatic organisms.
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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.
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.
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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