Some trains go____ the hills if they are too high to go over

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• 文章：There are all kinds of trains in the world.There are trains to carry people,trains to carry animals and trains to carry things.There are fast trains and slow trains.Some trains go under the ground and some trains go through hills.In big cities,the streets are usually very busy.So you can find trains under the ground and trains on a rail above the streets.They carry people in and out of the city.Can a train run over water?Yes,it can.There are many b
• 帮个忙：英语的词汇运用给的词语：shopping thing play problem cost city chance work care spaceNew York ,London,Paris and other big cities are exciting places to live in .There are many interesting 1.____ to see and to do .You can go to different kinds of museums,2.____and films.You can also go 3.____ to buy things from all over the world .But there are serious problems in big cities too.The 4.____ of living is high,and there are too many people in some of the big citie
• 帮忙看一下这首字母填空怎么填,New York,London,Paris and o__ big cities are exciting places to live in.You can go to d__ kinds of museum .You can go s__to buy things from all over the world.But there are many p__ in big cities,too.The cost of living is high,the pollution is serious and sometimes people can't find work o__ a good place to live in.Some people e__ living in a big cities ,others do not.
• some trains go through the hills if they are too high to go over 意思是：
• Some trains go____ the hills if they are too high to go over
• There are all kinds of trains in the world.ThereThere are all kinds of trains in the world.There are trains to carry people,and trains to carry animals or other things.There are fast trains and slow ones.Some trains go through hills.  In big cities,the main streets are usually very busy.So you can find trains on the rails under the ground or above the unimportant streets.They carry people quickly in and out of the cities.  Can a train run over the wat
• New York,London,Paris and other big cities are exciting places to live in.There are many interesting things to see and to do.You can go to different kinds of museums and theaters to see plays and films.You can also go shopping to buy things from all over the world.But there are more serious problems in big cities,too.The cost of living is high and there are too many people in some parts of big cities.Every year many people move to the cities because t
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