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Views on Cloning Almost everyone would agree that the birt......

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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
What do scientists say about the collision of an asteroid with Earth
A．It is very unlikely but the danger exists.
B．Such a collision might occur once every 25 years.
C．Collisions of smaller asteroids with Earth occur more often than expected.
D．It’’s still too early to say whether such a collision might occur.
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