【正文】 ne 25 refers to (A)June (B)corn (C)time (D)squash 10. Which of the following crops was cultivated primarily by men (A) Corn (B)Squash (C)Sunflower (D)Tobacco 11. Throughout the passage, the author implies that the Mandans (A)planned for the future (B) valued individuality (C)were open to strangers (D)were very adventurous D) harvesting squash. 7. The word disaster in line 22 is closest in meaning to (A)control 語言培訓(xùn) 資料下載 21 (B)catastrophe (C)avoidance (D)history 8. According to the passage, the Mandans preserved their food by (A)smoking (B)drying (C)freezing. (D)salting 9. The word it in line 25 refers to (A)June (B)corn (C)time (D)squash 10. Which of the following crops was cultivated primarily by men (A) Corn (B)Squash (C)Sunflower (D)Tobacco 11. Throughout the passage, the author implies that the Mandans (A)planned for the future (B) valued individuality (C)were open to strangers (D)were very adventurous Questions 1220 The elements other than hydrogen and helium exist In such small quantities that it is accurate to say that the universe somewhat more than 25 percent helium by weight and somewhat less than 25 percent hydrogen. Astronomers have measured the abundance of helium throughout our galaxy and in other galaxies as well. Helium has been found In old stars, in relatively young ones, in interstellar gas, and in the distant objects known as quasars. Helium nuclei have also been found to be constituents of cosmic rays that fall on the earth (cosmic rays are not really a form of radiation。 they consist of rapidly moving particles of numerous different kinds). It doesn39。t seem to make very much difference where the helium is found. Its relative abundance never seems to vary much. In some places, there may be slightly more of it。 In others, slightly less, but the ratio of helium to hydrogen nuclei always remains about the same. 語言培訓(xùn) 資料下載 22 Helium is created in stars. In fact, nuclear reactions that convert hydrogen to helium are responsible for most of the energy that stars produce. However, the amount of helium that could have been produced in this manner can be calculated, and it turns out to be no more than a few percent. The universe has not existed long enough for this figure to he significantly greater. Consequently, if the universe is somewhat more than 25 percent helium now, then it must have been about 25 percent helium at a time near the beginning.. However, when the universe was less than one minute old, no helium could have existed. Calculations indicate that before this time temperatures were too high and particles of matter were moving around much too rapidly. It was only after the oneminute point that helium could exist. By this time, the univ erse had cooled sufficiently that neutrons and protons could stick together. But the nuclear reactions that led to the formation of helium went on for only a relatively short time. By the time the universe was a few minutes old, helium production had effectively ceased. 12. what does the passage mainly explain? (A)How stars produce energy (B)The difference between helium and hydrogen (C)When most of the helium in the universe was formed (D)Why hydrogen is abundant 13. According to the passage, helium is (A) the secondmost abundant element in the universe (B) difficult to detect (C) the oldest element in the universe (D) the most prevalent element in quasars 14. The word constituents in line 7 is closest in meaning to (A) relatives (B) causes (C)ponents (D) targets 15. Why does the author mention cosmic rays39。t39。 in line 7? (A)As part of a list of things containing helium (B) As an example of an unsolved astronomical puzzle (C) To explain how the universe began (D) To explain the abundance of hydrogen in the universe 語言培訓(xùn) 資料下載 23 16. The word vary in line 10 is closest ill meaning to (A) mean (B) stretch (C) change (D) include 17. The creation of helium within stars (A) cannot be measured (B) produces energy (C) produces hydrogen as a byproduct (D) causes helium to be much more abundant In old stars than In young star: 18. The word calculated in line 15 is closest in meaning to (A) ignored (B) converted (C) increased (D) determined 19. Most of the helium in the universe was formed (A) in interstellar space (B) in a very short time (C) during the first minute of the universe39。s existence (D) before most of the hydrogen 20. The word ceased in line 26 is closest in meaning to (A)extended (B)performed (C)taken hold (D)stopped Questions 2130 In colonial America, people generally covered their beds with decorative quilts resembling those of the lands from which the quitters had e. Wealthy and socially prominent settlers made quilts of the English type, cut from large lengths of cloth of the same color and texture rather than stitched together from smaller pieces. They mad these until the advent of the Revolutionary War in I 775, when everything English came to be frowned upon. Among the wholecloth quilts made by these wealthy settlers during the early period are those now called linseywoolseys. This term was usually applied to a fabric of wool and linen used In heavy clothing and quilted petticoats worn in the wintertime. 語言培訓(xùn) 資料下載 24 Despite the name, linseywoolsey bedcovers did not often contain linen. Rather, they were made of a lop layer of woolen or glazed worsted wool fabric, consisting of smooth, pact yarn from long wool fiber dyed dark blue, green, or brown with a bottom layer of a coarser woolen material, either