单项选择题

The respiration of living things and the food production of plants are______.

A．separate processes
B．complementary
C．opposite
D．interdependent
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单项选择题
What's the author's attitude in the phrase of a sort ( Para. 4)
A．Questioning.
B．Neutral.
C．Positive.
D．Negative.
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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