阅读理解：
For years scientists have been worried about the effects
of air pollution on the earth‘s natural conditions.Some believe
the air inside many houses may be more dangerous than the air
outside.It may be one hundred times worse.
Indoor air pollution can cause a person to feel tired ,to
suffer eye-pain,headache and other problems.Some pollutants can
cause breathing disorders,diseases of blood and even cancer.Most
scientists agree that every modern house has some kind of indoor
pollution. people began to notice the problem in the early 1970s
It is that when builders began making houses and offices they did
not waste energy.To do this they built building that limited the
flow of air between inside and outside.They also began using man-
made building materials.These materials are now known to let out
haarmful gases.
As the problembecame more serioys,scientists began searching
for a way to deal with it.They discovered a natural pollution
control system for building--green plants.Scientists do not really
know how plants control air pollution.They believe that a plant’s
leaves absorb or take in the pollutants.In exchange the plant lets
out oxygen through its leaves and through its tiny organizations
on its roots. Scientists suggest that all buildings should have
one large plant or several small plants inside for every nine
square metres of space .Studies of different plants show that
each absorbs different chemicals.So the most effective way to
clean the air is to use different kinds of plants.Having green
plants inside your house can make it a prettier and more healthy
place.


54.Generally speaking,indoor air pollution may be more harmful
than the air outside because_______.
A. the man-made building materials let out dangerous gases
inside houses
B. there may be more harmful gases outside houses
C. the flow of air indoors is limited
D. indoor air pollution

55.The indoor air pollution is caused____________________
A. by the building method through which the builders want to
save energy
B. by the limit of the flow of air between inside and outside
C. by the building things which are made of man-made materials
D. not only by the limit of air -flow but also by the man-made
materials

56.The most effective way to clean the air is to use by the
man-made materials
A. they may let out more oxygen which people need
B. they can absorb different kinds of the harmful indoor
chemicals
C. they can take in all kinds of indoor pollutants
D. they can make your house prettier and more healthy



We are often asked to make a speech in life.Most of are
afraid of it and don‘t do a good job.Here are some simple steps
to make your speech a successful one. Frist of all,find out
everything you can about your subject and the same time find out
as much as you can about your audience.Who are they?What do they
about your subject?Put yourself in their shoes as you prepare
your speech.Then try to arrange your material so that your speech
is clear and easy to follow. Use as many examples as possible.
Never forget your audience.Don’t talk over their heads or talk
down to them. When you are giving your speech,speak slowly and
clearly and look at you aduience.Pause for a few seconds from time
to time to give your audience chance to think over what you‘ve
said.Just remember:be prepared ,know your subiect and your
audience ,say what you have to say and be yourself so that your
ideas will bring you and your audience together.

57.What should a speaker do if he wants to make his speech a
successful one?
A. He should get his subject well prepared.
B. He should express himself in an exciting way.
C. He should make himself heard and understood
D. All of the above.

58."Put yourself in their shoes as you prepare your speech."means
that while preparing your speech,you must____________
A. put your shoes aside and on theirs
B. try their shoes to see if they fit you
C. wear the shoes with the same size as theirs
D. try to imagine yourself to be in their position

59.When he is giving his speech,the speaker is to_________
A. Let his eyes rest on the subject
B. follow the audience step by step
C. face the audience in a natural way
D. look up and down feom time to time

60.During the course of the speech it is not right for a
speaker to__________.
A. think nothing of the audience
B. speak in a loud voice
C. take a short stop at times
D. refer to the notes once in a while

61.Which title best gives the main idea of the passage?
A. How to Remember the Audience?
B. How to Improve One’s Speech?
C. How to Prepare the Material for a Speech?
D. How to Pick Out the Topic for a Speech?






答案：
54-56: A D B
57-61: D D C A B