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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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

What can be inferred from this passage

A．Nowadays science is learning more and more about the impact humidity has on all of us by using sophisticated measuring devices.
B．Humidity could interfere with television signals.
C．Humidity may warp priceless antiques.
D．Visual disturbances may decrease in days of low humidity.