单项选择题

What does the passage mainly discuss

A．Characteristics of soil quality.
B．Particles typically found in soils.
C．The importance of soil texture.
D．How to determine soil textur
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单项选择题
It can be inferred from the passage that a soil sample with little or no clay in it ______.
A．will feel smooth when wet
B．may not keep its shape when molded
C．will be difficult to classify
D．may be sticky if too wet
单项选择题
It can be inferred from paragraph I that ff we don't take account of the fact that soils vary so much,______.
A．we won't know their properties
B．we won't make best use of the land
C．the ecosystem will fail
D．the row of water will deteriorate
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