2017年6月英语四级考试练习试卷及答案
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Part Ⅱ Reading Comprehension (35 minutes)
Directions: There are 4 passages in this passage is followed by some questions or unfinished each of them there are four choices marked A),B),C) and D) 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 were coming from a point in the sky where there was unknown 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 were rather afraid to tell in case they frightened signals were coming from a very small body—no bigger,perhaps than the 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 ead,the scientists studied the signals and searched for others like ,all that happened in 1967 and e then scientists have learnt more about those strange,regular,radio 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””t a hundred other pulsars have now been found,and most of them are very like the first one.
Pulsars are strong radio are the smallest but the heaviest stars we know at present.A handful of pulsar would weigh a few thousand r light—if they give much light—is too small for us to we can be sure of this,no intelligent beings are living on them.
21. The radio signals discussed in this passage____.
regular controlled by a clock
heard in 1967 only secret messages
22. The radio singals were sent by____.
A.a satelliteB.a planet
C.a sky body which was unknown at that time
lligent beings who were unknown at that time
23. The scientists did not tell people about the signals because____.
singals stood for secret messages
le would ask them too many questions
did not want to frighten people
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?
of the pulsars found by scientists sends radio signals.
ar began to send radio singals in 1967.
ntists have searched for pulsars for many years but found none.
ntists have found many pulsars since 1967.
Questions 26 to 30 are based on the following passage:
Over vast areas of every continent,the rainfall and vegetation necessary for life are ady more than 40 percent of the earth's land is desert or t 628 million people—one out of seven—live in these dry the past,they have managed to survive,but with difficulty.[ZZ(Z]Now largely through problems caused by modern life,their existence is threatened by the slow,steady spread of the earth's deserts.
Scientists still do not understand all the complex problems of the desert,but there have been many ideas for saving the i Arabia has planted 10 million
trees to help keep the sand from taking over fertile Israelis are aga
in using some of the water collection systems left by the ancient people in the
Negev plan to water their orchards with the extra Sahel farmers still raise cattle on their poor farm land,but before the cattle are sold,
they are taken to greener lands in the south to get fat.
26. What is the article mainly concerned?
problem of spreading desert.
rainfall and vegetation in desert areas.
water collection systems.
difference between modern life and ancient life.
27. “one out of seven” refers to____.
than a third of the lands' earth
percentage of the earth's land that is desert-like
number of people who live in dry regions
D.a day of a week
28. In paragraph 2,“they are taken to the greener lands in the south.”They
refers to____.
Sahel farm land farmers
cattles trees
29. How many ideas for saving the land are described?
. .
. e.
30. Which of the following statements is true, according to the passage?
earth's desert are slowly spreading.
out of 10 people lives in dry regions.
r life in the desert is threatened now by traditional problems.
water wells can solve the problem in Africa's desert.
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