PASSAGE 6

51. The word "major" in paragraph 1 is closest in meaning to

• A. intense

• B. principal

• C. huge

• D. unique

52. 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

53. The word "which" in paragraph 2 refers to

• A. dust

• B. gas

• C. pattern

• D. galaxy

54. 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

55. The word "symmetrical" in paragraph 2 is closest in meaning to

• A. proportionally balanced

• B. commonly seen

• C. typically large

• D. steadily growing

56. The word "obvious" in paragraph 2 is closest in meaning to

• A. discovered

• B. apparent  

• C. understood

• D. simplistic

57. 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.

58. 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.

59. What percentage of galaxies are irregular?

• A. 10%

• B. 25%

• C. 50%

• D. 75%

60. The word "they" in paragraph 3 refers to

• A. intervals

• B. yardsticks

• C. distances

• D. galaxies