大学英语四级考试模拟试卷习题包括答案21.doc

2019 年 12 月大学英语四级考试模拟试卷及答案(21)

PartⅡ Reading Comprehension (35 minutes)

Directions ： There are 4 passages in this part.Each

passage is followed by some questions or unfinished

statements.For each of them there are four choices marked

A),B),C) and D).You should decide on the best choice and mark

the corresponding letter on the Answer Sheet with a single line

through the center.

Questions 21 to 25 are based on the following passage：

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 second,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

答案

1

短文大意

1967 年人收到了一些太空信号。些信号来自太空中的某一恒

星域，它极有律，道是外星人向地球或我收的信号 ? 了不致在人当中造成恐慌，科学家一直保守着个秘密，并且一

直它行研究。如今，当然一切都真相大白。原来些信号都来自一种

叫脉冲星的恒星，它的密度极大光也以逃逸。但有一点能确定，上

面没有智能生命存有。

21.答案 A。

【参考文】文中到的磁信号⋯⋯

【分析】此考考生“辨事”的水平。

【解答】原文第一段，“ They were coming very

regularly,too. ”他同非常有律，与 A) 同意。 B)were

controlled by a clock.由控制，原文前面有一表示“似乎的”

if。C)，D)根据下文判断都不准确。

22.答案 C。

【参考文】些磁信号来自于⋯⋯

【分析】此考考生“根据已知信息行推断”的水平。

【解答】原文第三段“ ...they come from a new kind of star called a“pulsar””他来自一种叫脉冲星的新型恒星。

A) a satellite星，B)a planet行星，D)当未知的智能生命。

23.答案 C。

【参考文】科学家没有把相关磁信号的事情告人是因⋯⋯

【分析】此考考生“理解文章中某些”的水平。

ぁ鞠晗附獯稹原文第二段开“The scientists who heard