单项选择题

The inhabitants of La Gomera communicate by whistles ______.

A．all of time
B．whenever distance makes speech inconvenient or impossible
C．most of time
D．only on windy days
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单项选择题
Gomeros employ the silbo instead of visual signals such as gestures because ______.
A．this method makes communication more rapid
B．their level of intelligence is too low to let them learn a code
C．weather conditions usually affect visibility
D．they learn to whistle at an early age
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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