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
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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
单项选择题
What is the main subject of the passage
A．Methods of cleaning teeth.
B．Methods of caring for teeth.
C．Development of toothpaste.
D．Dental history.
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