A. DOING B. MAKING C. BEING D. GOINGREAD THE FOLLOWING PASSAGE AND...

42. A. doing B. making C. being D. goingRead the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correctanswer to each of the following questions from 43 to 50.The Sun today is a yellow dwarf star. It is fueled by thermonuclear reactions near its center that converthydrogen to helium. The Sun has existed in its present state for about four billion six hundred million years andis thousands of times larger than the Earth.By studying other stars, astronomers can predict what the rest of the Sun’s life will be like. About fivebillion years from now, the core of the Sun will shrink and become hotter. The surface temperature will fall. Thehigher temperature of the center will increase the rate of thermonuclear reactions. The outer regions of the Sunwill expand approximately 35 million miles, about the distance to Mercury, which is the closest planet to the Sun.The Sun will then be a red giant star. Temperatures on the Earth will become too high for life to exist.Once the Sun has used up its thermonuclear energy as a red giant, it will begin to shrink. After it shrinksto the size of the Earth, it will become a white dwarf star. The Sun may throw off huge amounts of gases inviolent eruptions called nova explosions as it changes from a red giant to a white dwart. After billions of yearsas a white dwarf, the Sun will have used up all its fuel and will have lost its heat. Such a star is called a blackdwarf. After the Sun has become a black dwarf, the Earth will be dark and cold. If any atmosphere remainsthere,it will have frozen over the Earth’s surface.