单项选择题

People attribute their longer working hours to ________.

A．the invention of fax
B．videoconferencing
C．the development of technology
D．the application of Email
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单项选择题
The word consensus (Line 9, Para. 4) probably means ________.
A．content
B．satisfaction
C．agreement
D．sense
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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