40. The world "major" in line 1 is closest in meaning to
(A) intense
(B) principal
(C) huge
(D) unique
41. What does the second paragraph mainly discuss?
(A) The Milky Way
(B) Major categories of galaxies
(C) How elliptical galaxies are formed
(D) Difference between irregular and spiral galaxies
42. The word "which" in line 7 refers to
(A) dust
(B) gas
(C) pattern
(D) galaxy
43. 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
44. The word "symmetrical" in line 9 is closest in meaning to
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