单项选择题

A．Seven o’’clock.
B．Seven thirty.
C．Eight o’’clock.
D．Eight thirty.
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单项选择题
Babies will not be stimulated to smile by a person______.
A．whose front view is fully perceived
B．whose face is covered with a mask
C．whose face is seen from the side
D．whose face is free of any covering
单项选择题
What does this refer to in the sentence This leaves gaps of bare soil... (Para. 4)
A．Cutting down trees and grasses and burning them.
B．The New Stone Age people’’s clearing of rain forest.
C．Planting of seeds in the bare soil.
D．This type of farming.
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