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
According to the passage, stronchium was most useful for______.
A．strengthening teeth
B．getting a foaming effect
C．reducing sensitivity
D．gums
单项选择题
According to the passage, it can be inferred that the Greeks and Romans ______.
A．also developed the toothbrush
B．were the first to support artificial teeth
C．had more dental problems than other cultures
D．did not keep records of their dental practices
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