单项选择题

A．Many hours.
B．One full day.
C．Two full days.
D．Three full days.
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单项选择题
The author is convinced that the eyes are______.
A．of extreme importance in expressing feelings and exchanging ideas
B．something through which one can see a person’’s inner world
C．of considerable significance in making conversations interesting
D．something the value of which is largely a matter of long debate
单项选择题
The crops’’ reception of the minimum of competition from other plants is necessary because______.
A．other plants competed with crops for sunlight and rain
B．people were farming in Asia, Africa and Europe
C．they could get rid of other plants
D．they wanted keep the biological balance
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