摘要:71. 72. 73. 74. 75. B.从方框中选择适当的单词.并用其正确形式完成短文. something.enjoy.difficult.difference.out There are many 76 kinds of trains in the world.There are fast trains and slow trains.There are trains under the ground and trains over the water. In big cities.the streets are usually busy.So you can find subways under the ground.They carry people in and 77 of the city. Can a train run over the water? Yes.it can.There are bridges over the river.The trains can easily go over the water.But it’s 78 to build the bridges. Today trains have dining―rooms for people.You may buy 79 to eat in them on the way if you are hungry. Trains are important for children.too.They have modeltrains.With the model trains they can 80 the beautiful world of trains.

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