20．A sign is another kind of language．Here are some of them that you can see on the roads．
Number One is a sign with the number forty on it．When driver see this sign，they must not go at more than forty kilometers one hour．We see this sign when we are getting near a town．Number Two is a sign that we're near a crossing．We must drive carefully．Number Three is a sign that there is a bend （彎道） on the road．Again，we must drive slowly and carefully．It is not safe to go round a bend very fast．Number Four is a sign that there is another road coming in from the right．There is a junction（交叉點） at this place．
Number Five is a sign that there is a dangerous mountain road and Number Six is a sign that the road gets narrow．Drivers must go slowly and carefully when they see these signs．Number Seven is a sign that there is a school at the side of the street or the road．Perhaps there are children going to or leaving school．So drivers must look carefully and go slowly．Number Eight is a sign with a letter"P"on it．The letter"P"means"Parking"．At some places，there are signs"NO PARKING"or"NO WAITING"．If a driver leaves his car near one of these signs，a policeman may come and write down the number of his car．
51．At the place where you see Sign 1，D．
A．you are already out of the town
B．you still have forty kilometers to go
C．there must be a town forty kilometers away
D．there must be many houses and buildings not far away
52．There stands Sign 2near a place whereA．
A．two roads cross
B．the road gets narrow
C．there are no traffic lights
D．people can cross the road
53．You have to drive not only slowly but also carefully when you findB according to the passage．
A．either of signs 2and 3
B．all of signs 3，5，6and 7
C．each of the eight signs
D．any of signs 3，6，7and 8
54．A driver can leave his carA．
A．near Sign 8at any time
B．near a sign with"NO PARKING"on it
C．near Sign 3in the daytime
D．near a sign with"NO WAITING"if there're no police there
55．People put these signs on the roads toC．
A．show drivers the way
B．stop cars going too fast
C．make driving even safer
D．learn another kind of language．
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