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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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
单项选择题
According to the passage, stronchium was most useful for______.
A．strengthening teeth
B．getting a foaming effect
C．reducing sensitivity
D．gums
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