Question 39-50 Line (1) Ouloxies are the major buiding blocks of the univerne. A galary in giant family of many millions of stars, and it is held together by its own gravational field. Most of the material many millions of stars, and it is held together by its own gravitational fit universe is organized into galaxies of stars together wath gas and dust. (5) is a spiral galoxy, a flattish disc of stars with two spiral arms emerging from its central nucleus. About one- quarter of all galasies have this shape. Spiral galaxies are well supplied with the intersteilar gas in which new ntars form as the rotating spiral pattern sweeps around the (10) obvious structure. Most of their member stars ate very old and since ellipticals are devoid of interstellar gas, no new stars are forming in them. The biggest and hrighte devoid of interstellar gas, no new stars are forming in them. The biggest and brightest galaxies in frequently be sources of strong radio eminsion, in which case they are called rindio galaxies. About two-thirds of all galaxies are elliptical irregular (15) all galaxies and they come in many subclasses. Measurement in space is quite different from measuremem 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 exampie. By comparison with these familiar yordsticks, the clistances to the galaxies are incomprehenaibly large, but they too are made (20) more manageable by using a time calibration in this cabe the distance that light travels in one year. On such a scale the nearest giant apiral galaxy, the Andromeda galaxy, is two miltion thousand million light years away. Their light was already haifway here before the Earth formed. The light from the nearby vitgo galaxy set out when reptiles still dominated (25) the animal world (25) the animal world The word 'major' in line 1 is closest in meaning to (1 Poin) (A) intense (8) prineipal (19) tuge Or ineque What does the second paragraph mainly discuss? (1 Poin) (a) the Maky wor (1) (9) Majir categnies of gailaxies (i) Differences betaken inegular and spiazi galaxies The word 'which' in line 7 refers to-(1 Poin) (A) dust (8) ga: O (ic) partem (1) (D) gavany According to the passage, new atars are formed in spiral galavies due to... (1 Poin) (A) an an eaplosion of gas (19) the oorturession of gas and dant (i) strong radio enission The word 'symmetrical" in line 9 is closest in meaning to . (1 Poin) (A) propartionaliy balarced (1) (a) commeniy neme (c) typically iaror (i) ateality goroma The word "obvious' in line 10 is closest in meaning to. (1 Poin) (A) tascowered (1) (a) apparent (i) inderstoon (0) simplistic According to the passage, which of the following is NOT true of elliptical galaxies? (1 Poin) (A) They are the ingest gataxies (19) ther moisy contian ate stars. (O) (i) They have a wererical shape Which of the following characteristics of radio galaxies is mentioned in the passage? (1 Poin) (1) (B) Ther are usualy too sumall to be seen with a telescope (1) They aue not an bright as spinti galavies. What percertage of galaxies are irregular? (1 Poin) (A) 10 in (1) 258 (c) sen (D) 75 x The word 'they' in line 19 refers to. (1 Pain) (A) (A) intervads (1) (i) yactstichs (G) distance (1) Distaries