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
Of the followings, which is NOT mentioned as one of the factors making the silbo superior to speech at long distance
A．There are no transients and overtones to be lost.
B．The silbo is superior to visual "code" and is as rapid as spoken Spanish.
C．The quality is limited by many variables.
D．Articulation does not suffer when loudness is increased.
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