问题
选择题
They are broadening the bridge to ________ the flow of traffic.(2011·山东)
A．put off
B．speed up
C．turn on
D．work out
答案
答案：B
B [考查短语动词的辨析。句意：他们正在拓宽桥梁以加快交通流量。put off推迟；speed up加快；turn on打开(水、电视、收音机、灯、煤气等)，(使)感兴趣； (使)兴奋；work out算出，实现。]