单项选择题


A．single
B．singular
C．plural
D．compound
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单项选择题
The underwater listening system was originally designed ______
A．to trace and locate enemy vessels
B．to monitor deep-sea volcanic eruptions
C．to study the movement of ocean currents
D．to replace the global radio communications network
单项选择题
According to the author's observation, college students ______
A．have never been so materialistic as today
B．have never been so interested in the arts
C．have never been so financially well off as today
D．have never attached so much importance to moral sense
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