单项选择题

A．At a fitness centre.
B．At a clinic.
C．At a school.
D．At a club.
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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
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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