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Some radio singals were heard in 1967.They were coming from a point in the
sky where there was unknown star.They were coming very regularly,too:about once
a seco nd,if they were controlled by clock.
The scientists who heard the signals did not tell anybody else.They were
rather afraid to tell in case they frightened people.The signals were coming
from a very small body—no bigger,perhaps than the earth.Was that why no light
could be seen from it?Or were the signals coming from a planet that belonged to
some other star?There was no end to the questions,but the scientists kept the
news secret.“Perhaps there are intelligent beings out there.”they thought,“who
are trying to send messages to other planets,or to us?So the news was not given
to the newspaper.Instead,the scientists studied the signals and searched for
others like them...Well,all that happened in 1967 and 1968.Since then scientists
have learnt more about those strange,regular,radio signals.And they have told
the story,of course.
The signals do not come from a planet;they come from a new kind of star
called a “pulsar””.About a hundred other pulsars have now been found,and most of
them are very like the first one.
Pulsars are strong radio stars.They are the smallest but the heaviest stars
we know at present.A handful of pulsar would weigh a few thousand tons.Their
light—if they give much light—is too small for us to see.But we can be sure of
this,no intelligent beings are living on them.
21. The radio signals discussed in this passage____.
A.were regular B.were controlled by a clock
C.were heard in 1967 only D.were secret messages
22. The radio singals were sent by____.
A.a satellite B.a planet
C.a sky body which was unknown at that time
D.intelligent beings who were unknown at that time
23. The scientists did not tell people about the signals because____.
A.the singals stood for secret messages
B.people would ask them too many questions
C.they did not want to frighten people
D.they stood for unimportant messages
24. A pulsar is____.
A. a small heavy star which sends out strong radio signals and cannot be
seen
B. a small heavy planet which sends out strong radio signals and cannot be
seen
C. a small heavy satellite which sends out strong radio signals and cannot
be seen
D. a small intelligent being who sends out strong radio signals and cannot
be seen
25. Which of the following is true?
A.One of the pulsars found by scientists sends radio signals.
B.Pulsar began to send radio singals in 1967.
C.Scientists have searched for pulsars for many years but found none.
D.Scientists have found many pulsars since 1967.
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