"I WILL LET YOU KNOW THE ANSWER BY THE END OF THIS WEEK,” TOM SAID...

Câu 40: "I will let you know the answer by the end of this week,” Tom said to Janet.A. Tom suggested giving Janet the answer by the end of the week.B. Tom promised to give Janet the answer by the end of the week.C. Tom insisted on letting Janet know the answer by the end of the week.D. Tom offered to give Janet the answer by the end of the week.V. Đọc kỹ đoạn văn sau và chọn phương án đúng (A hoặc B, C, D) cho mỗi câu từ 41 đến 50.The Sun today is a yellow dwarf (lùn) star. It is fueled by thermonuclear (hạt nhân nóng) reactionsnear its center that convert hydrogen to helium. The Sun has existed in its present state for about four billionsix hundred million years and is 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 five billion years from now, thecore of the Sun will shrink (co lại) and become hotter. The surface temperature will fall. The highertemperature of the center will increase the rate of thermonuclear reactions. The outer regions of the Sun willexpand 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. Oncethe Sun has used up its thermonuclear energy as a red giant, it will begin to shrink. After it shrinks to the sizeof the Earth, it will become a white dwarf star. The Sun may throw off huge amounts of gases in violenteruptions called nova explosions as it changes from a red giant to a white dwarf. After billions of years as awhite 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.