单项选择题
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A.He’’s unwilling to fetch the laundry.
B.He has already picked up the laundry.
C.He will go before the laundry is closed.
D.He thinks his mother should get the clothes back.
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单项选择题
The least serious damage caused by acid rain is _________.
A.poisoning of plant roots
B.leaching of heavy metals
C.changing the blood chemistry in
D.corrosion of metal structures
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单项选择题
A.Light speed is millions of times faster than sound speed.B.Light speed is a million times slower than sound speed.C.Light speed is about millions of times faster than sound speed.D.Light speed is about a million times faster than sound speed.
A.Light speed is millions of times faster than sound speed.
B.Light speed is a million times slower than sound speed.
C.Light speed is about millions of times faster than sound speed.
D.Light speed is about a million times faster than sound speed.
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