单项选择题

According to the passage, who shall we fall back on for a better future for the environment

A．Our predecessors
B．Politicians
C．Computers
D．Young people
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单项选择题
Forty years ago people were indifferent to the health of the ocean because ______.
A．the ocean was immune to any pollution then
B．they didn't know what would come of if the ocean was deadly disrupted
C．there was no computer then
D．there wasn't any problem with ocean at that time
单项选择题
The writer's attitude to the prospect of the ocean is ______.
A．desperate
B．unconcerned
C．optimistic
D．pragmatic
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