1997年10月托福考试阅读理解全真试题
（D） unique
40.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
41.The word "which" in line 10 refers to
（A） dust
（B） gas
（C） pattern
（D） galaxy
42.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
43.The word "symmetrical" in line 14 is closest in meaning to
（A） proportionally balanced
（B） commonly seen
（C） typically large
（D） steadily growing
44.The word "obvious" in line 14 is closest in meaning to
（A） discovered
（B） apparent
（C） understood
（D） simplistic
45.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.
46.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.
47.What percentage of galaxies are irregular？
（A） 10%
（B） 25%
（C） 50%
（D） 75%
48.The word "they" in line 29 refers to
（A） intervals
（B） yardsticks
（C） distances
（D） galaxies
49.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.
50.The word "dominated" in line 37 is closest in meaning to
（A） threatened
（B） replaced
（C） were developing in
（D） were prevalent in