单项选择题

The philosophy class began with twenty students but three ______ after the midterm exam.

A．picked up
B．turned out
C．dropped out
D．kept up
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单项选择题
Technology has ______ the sharing, storage and delivery of information, thus making more information available to more people.
A．finished
B．furnished
C．functioned
D．facilitated
单项选择题
Telecommunication developments have enabled people to send messages ______ television, radio and electronic mail.
A．via
B．amid
C．past
D．across
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