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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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.
单项选择题
What is implied in the last paragraph
A．Public services are ineffective.
B．Cities are increasing too fast.
C．Population is not linked with development.
D．Government should be responsible for the problems in the cities.
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