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
Why was the death regarded silent
A．Because it's quiet after an explosion,
B．Because the people were killed outright.
C．Because when it came, the victims were in sleep,
D．Because it happened suddenly.
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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