单项选择题
Pedestrian zones reduce city center pollution.（）
A. Traffic reductions have improved city center air quality. B. Larger roads have reduced city center traffic jams. C. Cycle areas have improved the flow of city center traffi
单项选择题 When at a terminal for public transportation, never leave your luggage unattended.（）
单项选择题 NOTICES FOR DISPLAY ABOVE THIS PHOTOCOPIER MUST FIRST BE HANDED TO RECEPTION.（）
单项选择题 DELAYS EXPECTED ON COMMUTER TRAIN SERVICES.
