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.

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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

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