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
What caused the disaster at Lake Nyos
A．Terrorism.
B．Volcanic eruption.
C．Release of CO2 at a nearby lake.
D．A limnic eruption at Lake Nyos.
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
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