They are broadening the bridge to ________ the flow of traffic.(2011·山東)
A．put offB．speed up
C．turn onD．work out
B
B　[考查短語動詞的辨析。句意：他們正在拓寬橋梁以加快交通流量。put off推遲；speed up加快；turn on打開(水、電視、收音機(jī)、燈、煤氣等)，(使)感興趣； (使)興奮；work out算出，實現(xiàn)。]
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