London's road traffic map is like a cobweb(蜘蛛网) of small streets, offering drivers more when one road is blocked.
A. barriers
B. characters
C. similarities
D. alternatives
网友回答
A. barriers
B. characters
C. similarities
(答案→)D. alternatives
解析：A. barriers障碍，B. characters性格，特点，C. similarities 相似处，D. alternatives可供选择的事物，取舍，句意：伦敦的公路交通地图就像一个很多小街道的蜘蛛网，当一条路被堵塞的时候提供给司机更多选择。所以选D。