单项选择题

What has happened to the earth's temperature over the last 18 years according to satellite data

A．It has increased slightly.
B．It has not changed.
C．It has decreased slightly.
D．It is not sure if it has changed.
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单项选择题
Why is it possible that economic growth and technological progress are environmentally friendly
A．Because they can keep people away from the natural world.
B．Because they may help preserve more natural land.
C．Because they can increase productivity.
D．Because they may not produce pollutants.
单项选择题
What is the writer's attitude to the climate in the future
A．Disappointed.
B．Pessimistic.
C．Concerned.
D．Optimistic.
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