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【单选题】
对于小行星，我们可以在20年前就预测出它的运行轨道，但是对于长周期彗星来说，我们最多也只有（ ）年的预警时间，因为它飞行速度太快了，因此对人类构成的威胁更大。A.
1
B.
2
C.
5
D.
8
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A.
resign
B.
surrender
C.
release
D.
abandon
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【单选题】It's from April 7th( ).
A.
from the 15th
B.
to the 15th
C.
in the 15th
D.
of the 15th
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