单项选择题

The United Nations Conference was held to discuss ______.

A．ideological and individual differences
B．production
C．drug abuse
D．nations of file world
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单项选择题
The United Nations Conference ______.
A．was not as intense as previous meetings
B．failed to recognize drug problems in many countries
C．was successful in developing a two-level action plan
D．showed governments' confidence in handling their own problems independently
单项选择题
The colonization of Australia started in ______.
A．1768
B．1778
C．1788
D．1798
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