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
According to the passage, British philosopher Bertrand Russell supported the idea that ________.
A．work is virtuous
B．people should work fourteen hours a day in most industrialized countries
C．people should work only four hours a day
D．people should set aside more time to develop personal relationships
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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