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.
在1967年你会听说一些无线电信号。他们来自天空中一处未知的星球。他们同样非常有规律，如果用时钟计时的话：每秒一次。
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.
听到这些信号的科学家们并没有告诉任何人，他们怕告诉别人引起他们的恐惧，这些信号是来自一个非常小的物体，没有更大的，也许比地球小。为什么没有光可以看到它？或者是来自一颗属于另一颗恒星的行星的信号？这些都是找不到答案，但科学家们一直在说：“也许那里有外星人。”他们想，“谁会尝试把信息发送到其他星球，或者给我们呢？所以这些都没有公布于众。反而，科学家们一直都在研究了信号，并寻找其他的像他们一样信号源……嗯，所有谜底都在1967年和1968年揭开，从那时起，科学家们已经了解到了更多关于
这些奇怪的/有规律的无线电信号。当然，他们已经说出了这些事的内情。
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.
信号不是来自一个星球，它们来自于一种新的恒星叫做“脉冲星”。其他一百颗脉冲星已经被发现，它们中的大多数人都很喜欢第一个。
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.
脉冲星是强大的无线电星星。据我们所知，它们虽然是最小的恒星，但目前来说也是最重的恒星。几个脉冲星重达几千吨。它们的光源太小，所以我么看不见它。但是我们可以肯定，没有外星人住在那里。
21. The radio signals discussed in this passage_查看答案___. 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__查看答案__. 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__查看答案__.
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__查看答案__.
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__查看答案__?
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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