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.
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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.
单项选择题
The main idea of the passage is about ______.
A．the main source of humidity
B．the impact of humidity on our world and ourselves
C．how humidity affect our life
D．the damage humidity has done to our world
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