单项选择题

The passage is mainly about ______.

A．the causes for a disaster
B．African volcanic eruptions
C．how to tame a killer lake
D．discussion of how to protect the pastures in Africa
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单项选择题
to degas the lake in the third paragraph means ______.
A．to remove gas from the lake
B．to inflate gas into the lake
C．to purify the lake
D．to exploit the lake to produce gas
单项选择题
The author most likely agrees that ______.
A．better city, better life
B．both urban and rural areas have their advantages
C．the larger population, the faster a city develops
D．both urban and rural areas have their problems
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