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一篇英语首字母填空!In big cities,the streets are usually very busy.So

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一篇英语首字母填空!
In big cities,the streets are usually very busy.So you can .f.trains under the ground or on a rail above the streets.They carry people .q.in and out of the city.
Can a train run over water?Yes,it can.There are also many .b.over the rivers.The train can easily run over the water.There are also many tunnels .u.rivers.The train can go through the tunnels swiftly.But it is not easy to .b.the bridges or make the tunnels.Would you like to take a maglev train in Pudong,Shanghai?It can speed up to 431 km per hour.It is the .f.train in China.
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