单项选择题

Most of corn and wheat is______________.

A．sold to feed people
B．exported to foreign countries
C．sold to fatten cattle and pigs
D．sold as food
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单项选择题
I do not remember ________________ this book before.
A．reading
B．having ever read
C．to have ever read
D．to read
单项选择题
It takes about 365N days for the Earth to ____________ around the Sun in its orbit.
A．rotate
B．roll
C．spin
D．revolve
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