__________是最大的生态系统。
生物圈
A yellow taxi _______ alongside a truck at the traffic lights when an elderly woman was crossing the road.
A.brought up
B.took up
C.pulled up
D.put up
国家安全机关的工作人员在依法执行紧急任务的情况下,遇交通阻碍时,经出示相应证件,也不能优先通行。