单项选择题

A．Cooler and drier.
B．Cooler and rainier.
C．Warmer and drier.
D．Warmer and rainier.
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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.
单项选择题
A
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