单项选择题

An effort to increase the loudness of the silbo ______.

A．results in a lower degree of articulation
B．is impossible because of the wind
C．exhausts the silbador
D．does not affect its intelligibility
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单项选择题
The insurance of ordinary business risks is not possible because ______.
A．businessmen will not buy insurance
B．the risks are too high
C．the risks can not be estimated
D．the premium would not be too high
单项选择题
According to the passage, speech is commonly thought of as ______.
A．a method of communicable based on sounds
B．a substitute for oral methods of communicable
C．the least common method of communicable
D．an inferior method of communication
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