单选题
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
【正确答案】
B
【答案解析】
从文章第一段最后一句话可得出答案。
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