---CAUTION--- HAZAROUS CAUTIONS AHEAD ROUGH, NARROW ROAD WITH LOOSE GRAVEL, STEEP GRADES AND BLIND CURVES DO NOT EXCEED 15 M. P.

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问题 ---CAUTION---
HAZAROUS CAUTIONS AHEAD
ROUGH, NARROW ROAD WITH
LOOSE GRAVEL, STEEP GRADES
AND BLIND CURVES
DO NOT EXCEED 15 M. P. H.
ATTENTION
VEHICLES OVER 21 FT/6.4M
PROHIBITED BEYOND THIS POINT
What is the highest driving speed allowed here?

选项 A、0M.P.H.
B、5M.P.H.
C、2 M.P.H.
D、6.4M.P.H.

答案B

解析 路牌中提示说:“车长超过21英尺或6.4米,此处禁行”,所以(C)和(D)的数据均与题目无关。
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