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

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单项选择题

Special words used in technical discussion ______.

A．never last long
B．should be confined to scientific fields
C．are considered artificial language speech
D．may become part of common speech

单项选择题

The documents adopted ______.

A．proved to be a point of argument between the countries
B．were identical to one another
C．included an agreement between the nations involved to fight the drug problem
D．were not very specific or