TOEFL READING PRACTICE WITH ANSWERS
TOEFL 9 (READING PASSAGE 5)
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Question
39-50
Galaxies
are the major building blocks of the universe. A galaxy is giant family of
many millions of stars, and it is held together by its own gravitational
field. Most of the material universe is organized into galaxies of stars
together with gas and dust.
There
are three main types of galaxy: spiral, elliptical, and irregular. The
Milky Way is a spiral galaxy, a flattish disc of stars with two spiral arms
emerging from its central nucleus. About one-quarter of all galaxies have
this shape. Spiral galaxies are well supplied with the interstellar gas in
which new stars form: as the rotating spiral pattern sweeps around the
galaxy it compresses gas and dust, triggering the formation of bright young
stars and in its arms. The elliptical galaxies have a symmetrical elliptical
or spheroidal shape with no obvious structure. Most of their member stars
are very old and since ellipticals are devoid of interstellar gas, no new
stars are forming in them. The biggest and brightest galaxies in the
universe are ellipticals with masses of about 1013 times that of the Sun,
these giants may frequently be sources of strong radio emission, in which case
they are called radio galaxies. About two-thirds of all galaxies are
elliptical. Irregular galaxies comprise about one-tenth of all galaxies and
they come in many subclasses.
Measurement
in space is quite different from measurement on Earth. Some terrestrial distances
can be expressed as intervals of time, the time to fly from one continent
to another or the time it takes to drive to work, for example. By
comparison with these familiar yardsticks, the distances to the galaxies
are incomprehensibly large, but they too are made more manageable by using
a time calibration, in this case the distance that light travels in one
year. On such a scale the nearest giant spiral galaxy, the Andromeda
galaxy, is two million light years away. The most distant luminous objects
seen by telescopes are probably ten thousand million light years away. Their
light was already halfway here before the Earth even formed. The light from
the nearby Virgo galaxy set out when reptiles still dominated the animal
world.
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39
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The word "major"
in line 1 is closest in meaning to
(A) intense
(B) principal
(C) huge
(D) unique
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40
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What does the second paragraph mainly discuss?
(A) The Milky Way
(B) Major categories of galaxies
(C) How elliptical galaxies are formed
(D) Differences between irregular and
spiral galaxies
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41
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The word "which" in line 7
refers to
(A) dust
(B) gas
(C) pattern
(D) galaxy
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42
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According to the passage, new stars are formed
in spiral galaxies due to
(A) an explosion of gas
(B) the compression of gas and dust
(C) the combining of old stars
(D) strong radio emissions
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43
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The word "symmetrical" in line
9 is closest in meaning to
(A) proportionally balanced
(B) commonly seen
(C) typically large
(D) steadily growing
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44
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The word "obvious" in line 10
is closest in meaning to
(A) discovered
(B) apparent
(C) understood
(D) simplistic
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45
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According to the passage, which of the following
is NOT true of elliptical galaxies?
(A) They are the largest galaxies.
(B) They mostly contain old stars.
(C) They contain a high amount of
interstellar gas.
(D) They have a spherical shape.
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46
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Which of the following characteristics of
radio galaxies is mentioned in the passage?
(A) They are a type of elliptical galaxy.
(B) They are usually too small to be seen
with a telescope.
(C) They are closely related to irregular
galaxies.
(D) They are not as bright as spiral
galaxies
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47
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What percentage of galaxies are
irregular?
(A) 10%
(B) 25%
(C) 50%
(D) 75%
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48
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The word "they" in line 21
refers to
(A) intervals
(B) yardsticks
(C) distances
(D) galaxies
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49
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Why does the author mention the Virgo galaxy
and the Andromeda galaxy in the third paragraph?
(A) To describe the effect that distance
has no visibility.
(B) To compare the ages of two relatively
young galaxies.
(C) To emphasize the vast distances of
the galaxies from Earth.
(D) To explain why certain galaxies
cannot be seen by a telescope.
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50
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The word "dominated" in line 26
is closest in meaning to
(A) threatened
(B) replaced
(C) were developing in
(D) were prevalent in
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ANSWER KEY
39.
B
40.
B
41.
B
42.
B
43.
A
44.
B
45.
C
46.
A
47.
A
48.
C
49.
C
50.
D
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