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 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.
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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