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.
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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
Which of the following is true of the idea of degassing the lake
A．h was a good idea.
B．Some scientists veto it.
C．It's impossible.
D．Some farmers still venture back with their livestock.
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