单项选择题

Why did the number of complaints drop

A．Because they got poor reception.
B．Because the humidity was interfering with the signals.
C．Because there came a blast of dry air.
D．Because humidity increased rapidly in the region.

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单项选择题

Why does a tuner often stand in the wings

A．So it can be reached any time.
B．It is so designed mechanically.
C．So it can prevent moisture.
D．The piano needs to be tuned frequently.

单项选择题

Which of the following is NOT included as source of humidity in this passage

A．Oceans.
B．Plants.
C．Air.
D．Dryers.