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完形填空.In big cities,the streets are usually very busy .So you

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完形填空.
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 many b___ over the rivers.The trains can easily run over the water.There are also many tunnels u___ rivers.The trains 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.
In big cities,the streets are usually very busy .So you can f__ind__ trains under the ground or on a rail above the streets.They carry people q_uickly__ in and out of the city.Can a train run over water Yes,it can.There are many b_ridges__ over the rivers.The trains can easily run over the water.There are also many tunnels u_nder__ rivers.The trains can go through the tunnels swiftly.But it is not easy to build__ 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_astest__ train in China.