World's first traffic lights were used inDetroit, the USA, in 1919. The first traffic lightsin Britain were used in Wolver Hampton in 1928.However, they didn't come to London till 1932.First Traffic PolicewomenPolicewomen appeared for traffic control dutiesfor the first time in Paris in ...
** 根据文章第二段第一句话“Before there were traffic lights for cars, there were traffic signals (信号) for trains. At first, railway companies used red to mean "stop", white to mean "go" and green to mean "slow down". ”可知,最初铁路公司用白色代表“前进”。 **67. What do we ...
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根据第五段最后两句"T he firsttraffic lights in Britain were used in Wolverhampton in 1928. However, they didn't come toLondon till 1932.(1928年,伍尔弗汉普顿市使用了英国的第一个红绿灯。然而,他们直到1932年才来到伦敦。)”可知,伦敦在1932年开始使用交通灯。结合选项,A选项的意思是伦敦;B选项的...
world's first traffic lights were used in De-troit, the USA, in 1919. The first traffic lights inBritain were used in Wolver Hampton in 1928. Howev-er, they didn't come to London until 1932.First Traffic PolicemenPolicemen appeared for traffic control duties forthe first time in Paris in...
根据第一段he started to write his first Kungfu novel when he was 31 years old,可知,金庸是在31岁开始写小说的,所以A选项是错误的,排除.根据第二段They were sold all over the world and translated into over 50 languages,可知,金庸的小说被翻译成50多种语言,所以B选项是错误的,排除.根据最后一段It...
Why couldn't they be colors like blue, brown or orange? _1Well, it's important to know that before there were traffic lights for cars, there were traffic signals(信号) for trains. At first, railway companies(公司) used red to mean "stop",white to mean "go" and green to tell ...
A When we were little kids, we knew about traffic lights. The color red means stop, the color green means go and the color yellow means slow down or show some caution(小心). But why are these colors used for traffic lights?Why couldn't they be colors like blue, brown or orange? He...
How could we tell time if there were no watches or clocks anywhere in the world? The ___ was probably the world's first “clock”, except in the far north, where the Eskimos live. There, it's dark most of the winter, and ___ most of the summer. But ___ most...
When people first began to write, they did not use an alphabet. ___, they drew small pictures to show the objects they were writing about. This was very ___ because there was a different picture for every word.The Ancient Egyptians had a ___ of picture writing that was called hierogly...