Two men took on the job of human traffic signals at an intersection in Shijiazhuang, Hebei province, when the electric traffic signals broke down and several traffic accidents occurred over the past month. They set up temporary signals using large plastic boards with the words "stop" and "go", turning in one direction or another every 30 seconds to aid drivers. The city was evaluating the problem with the lights and sent police officers to direct rush-hour traffic.
How often did the human traffic lights change direction?
A. Every 20 seconds
B. Every 30 seconds
C. Every 40 seconds
2015届高考英语一轮复习基础提升晨练:Module 6《Old and New》(外研版必修3)
2015届高三英语一轮学以致用训练:专题复习6(北师大版)
2015届高考英语一轮复习基础提升晨练:Module 3《My First Ride on a Train》(外研版必修1)
2015届浙江省高考英语一轮复习训练:必修三 Unit 4《Astronomy the science of the stars》
2015届浙江省高考英语一轮复习训练:必修二 Unit 5《Music》
2015届高考英语一轮复习基础提升晨练:Module 4《Sandstorms in Asia》(外研版必修3)
2015届高考英语一轮复习基础提升晨练:Module 4《Great Scientists》(外研版必修4)
2015届高三英语一轮学以致用训练:专题复习9(北师大版)
2015届高考英语一轮复习基础提升晨练:Module 5《Ethnic Culture》(外研版选修7)
2015届浙江省高考英语一轮复习训练:必修四 Unit 1《Women of achievement》
2015届高考英语一轮复习基础提升晨练:Module 6《War and Peace》(外研版选修6)
2015届高考英语一轮复习基础提升晨练:Module 5《A Trip Along the Three Gorges》(外研版必修4)
2015届高三英语一轮学以致用训练:专题复习1(北师大版)
2015届浙江省高考英语一轮复习训练:必修三 Unit 3《The Million Pound Bank Note》
2015届浙江省高考英语一轮复习训练:必修二 Unit 2《The Olympic Games》
2015届高三英语一轮学以致用训练:专题复习2(北师大版)
2015届高考英语一轮复习基础提升晨练:Module 5《Great People and Great Inventions of Ancient China》(外研版必修3)
2015届高考英语一轮复习基础提升晨练:Module 6《Animals in Danger》(外研版必修5)
2015届浙江省高考英语一轮复习训练:必修三 Unit 5《Canada—“The True North”》
2015届浙江省高考英语一轮复习训练:必修四 Unit 2《Working the land》
2015届高考英语一轮复习基础提升晨练:Module 4《Carnival》(外研版必修5)
2015届高考英语一轮复习基础提升晨练:Module 4《Music》(外研版选修6)
2015届浙江省高考英语一轮复习训练:必修三 Unit 1《Festivals around the world》
2015届高三英语一轮学以致用训练:专题复习3(北师大版)
2015届高考英语一轮复习基础提升晨练:Module 4《Which English》(外研版选修8)
2015徐州市高考英语一轮回顾练习:单项选择(12)
2015届高考英语一轮复习基础提升晨练:Module 3《The Violence of Nature》(外研版必修3)
2015届高考英语一轮复习基础提升晨练:Module 5《The Conquest of the Universe》(外研版选修8)
2015届高考英语一轮复习基础提升晨练:Module 5《The Great Sports Personality》(外研版必修5)
2015届高考英语一轮复习基础提升晨练:Module 6《The World’s Cultural Heritage》(外研版选修7)
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