阅读理解(每小题2分，共20分)
A
There are trains to carry people，trains to carry animals or carry things．There are fast trains and slow ones．Some trains go through hills．In big cities，the streets are usually very busy．So you can find trains under the ground．they carry people quickly in and out of the big cities．Can a train run over the water？Yes，it can．There are many bridges over the rivers．The trains can easily run over the water．But it is not easy to build the bridges．Today’s trains have dining rooms for people．You may eat something in them on the way if you are hungry．Trains are useful to men，women and children．Many children have model trains．With the model trains they can build their own rails(铁轨) and enjoy the wonderful world of trains．
There are all kinds of trains．Here " all kinds of trains" means ________．

A．fast trains and slow trains

B．many different kinds of trains

C．trains to go through hills

D．trains to carry people

The trains carry people in and out of the big cities under the ground because ________．

A．the streets are very busy

B．the cities are big

C．the trains have dining rooms

D．the cities are too small

If you are hungry，you may go to ________ of the train to have something to eat when you are traveling by train．

A．some rooms

B．some shops

C．the dining room

D．the station

It’s ________ for trains to run over the water but ________to build bridges．

A．easy；easy

B．easily；not easy

C．difficult；easily

D．easy；difficult

Which of the following is WRONG？

A．There are dining rooms in trains．

B．There are fast trains and slow trains．

C．The trains can only carry people．

D．We can see trains under the ground．