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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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
What is implied by saying a layer of soil acts as a sponge (Para. 2)
A．Soil can be used to clean things.
B．Soil can store water and give it up when needed.
C．Soil is all elastic material.
D．Soil can provide water.
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