单项选择题

This line was carrying equal number of eastbound and westbound trains, and they _________ regularly.

A．altered
B．alternated
C．switched
D．exchanged
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单项选择题
Pubs have fanciful names like The Red Lion or The Pig and Whistle and they often have picutre on a signboard outside to _________ the name.
A．justify
B．illustrate
C．modify
D．clarify
单项选择题
The library published a collection of books recently made _________ to the public.
A．acceptable
B．accessible
C．accommodable
D．accountable
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