【正文】 lf of the weight 7. Archaeologists study —— to trace ancient trade routes because such tools are relatively rare, and each occurrence has a slightly different chemical position. (A) which obsidian tools (B) obsidian tools (C) how obsidian tools 你的考試好幫手，記住我們的網(wǎng)址： 閱讀網(wǎng) (D) obsidian tools are 8. —— the hamster39。s crust, reveal —— at the time the rocks were formed. (A) what was like (B) was like life (C) what life was like 你的考試好幫手，記住我們的網(wǎng)址： 閱讀網(wǎng) (D) life was like 14. Although the huge ice masses —— glaciers move slowly, they are a powerful erosive force in nature. (A) call them (B) are called (C) to call (D) called 15. The soybean contains vitamins, essential minerals, —— high percentage of protein. (A) a (B) and a (C) since a (D) of which a 16. A gene is a biological unit of information who directs the activity of a cell or anism during its A B C D lifetime. 你的考試好幫手，記住我們的網(wǎng)址： 閱讀網(wǎng) 17. The flowering of African American talent in literature, music, and art in the 192039。s temperature. 你的考試好幫手，記住我們的網(wǎng)址： 閱讀網(wǎng) A B C D 27. Because of various giftgiving holidays, most stores clothing in the United Sates do almost as much A B business in November and December as they do in the other ten months bined. C D United States National Labor Relations Board is authorized to investigation allegations of unfair A B labor practices on the part of either employers or employees. C D Great Potato Famine in Ireland in the 184039。s and apes. A B C D may be hard or soft, depending on the amount of water left into it and the character of A B C D the cuting. carbonare lamp, a very bright electric lamp used for spotlights, consists of two carbon 你的考試好幫手，記住我們的網(wǎng)址： 閱讀網(wǎng) A B electrodes with a highcurrent are passing between it. C D 35. At first the poems of . Cummings gained notoriety to their idiosyncratic punctuation and A B typography, but they have gradually been recognized for their lyric power as well. C D mechanism of human thought and recall, a subject only partly understood by scientists, is A B C extraordinary plicated. D the process of photosynthesis in green plants, light energy is captured and used A B to convert water, carbon dioxide, and minerals into oxygen and anic pounds. 你的考試好幫手，記住我們的網(wǎng)址： 閱讀網(wǎng) C D globe artichoke was known as a delicacy at least 2,500 years ago, and records of its A B C cultivation date from fifteenth century. D 39. Humans do not constitute the only species endowed with intelligence: the higher animals also A B C have considerably problemsolving abilities. D 40. Many of species of milkweed are among the most dangerous of poisonous plants, while others A B C have little, if any, toxicity. D Questions 110 你的考試好幫手，記住我們的網(wǎng)址： 閱讀網(wǎng) In the early 180039。s and the First World War (19141918), approximately 23 million immigrants streamed to the United States, settled in cities, and went to work in factories and mines. They also helped 15） build the vast work of canals and railroads that crisscrossed the continent and linked important trade centers essential to industrial growth. Factories also offered a reprieve from the backbreaking work and financial unpredictability associated with farming. Many adults, poor and disillusioned with farm life, were lured to the cities by promises of steady employment, regular paychecks, 20) increased access to goods and services, and expanded social opportunities. Others were pushed there when new technologies made their labor cheap or expend