单项选择题

Nowadays people work hard because ________.

A．they want to get ahead
B．they don't want to get sacked
C．they enjoy working so much
D．they believe work is virtuous
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单项选择题
The word interminable (Line 5, Para. 4) probably means ________.
A．intermittent
B．short
C．limited
D．endless
单项选择题
It can be inferred from the third paragraph that in the mid-twentieth century ________.
A．there was no great adverse effect of human activities upon ocean ecosystems
B．no other human activities but navigation caused marine pollution
C．maritime countries still favored the freedom to fish in the open-seas
D．the lack of technology for further exploitation partly prevented marine pollution
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