句子插入题1

■Cases in which many species become extinct within a geologically short interval of time are called mass extinctions. ■There was one such event at the end of the Cretaceous period (around 70 million years ago). ■There was another, even larger, mass extinction at the end of the Permian period (around 250 million years ago). ■The Permian event has attracted much less attention than other mass extinctions because mostly unfamiliar species perished at that time. In general, it is believed that these two extinctions resulted from drastic environmental changes that followed meteorite impacts or massive volcanic eruptions.
OG 85 12
Paragraph 3: ■Exhibitors, however, wanted to maximize their profits, which they could do more readily by projecting a handful of films to hundreds of customers at a time (rather than one at a time) and by charging 25 to 50 cents admission. ■About a year after the opening of the first Kinetoscope parlor in 1894, show men such as Louis and Auguste Lumiere, ThomasArmat and Charles Francis Je nkins, and Orville and Woodville Latham (with the assistance of Edison's former assistant, William Dickson) perfected projection devices. ■These early projection devices were used in vaudeville theaters, legitimate theaters, local to wn halls,makeshift storefront theaters, fairgrounds, and amusement parks to sh ow films to a mass audience.■ 12. Look at the four squares [■] that indicate where the following sentence can be added tothe passage. When this widespread use of projection technology began to hurt his Kinetoscope business,Edison acquired a projector developed by Armat and introdu ced it as “Edison’s latest marvel,the Vitascope." Where would the sentence best fit?
• One interpretation regarding the absence of fossils during this important 100-million-year period is that early animals were soft bodied and simply did not fossilize. ■ Fossilization of soft-bodied animals is less likely than fossilization of hard-bodied animals, but it does occur. ■ Conditions that promote fossilization of soft-bodied animals include very rapid covering by sediments that create an environment that discourages decomposition.■ In fact, fossil beds containing softbodied animal shave been known for many years. ■ • It is relatively rare because the fossilization of softbodied animals requires a special environment.
上文中标注 ■ 的位置是如下句子可能插入的地方
All three of them have strengths and weaknesses, but none adequately answers all of the questions the paintings present. Where would the sentence best fit?
例2
• Another explanation for the focus on animals might be that these people sought to improve their luck at hunting. ■ This theory is suggested by evidence of chips in the painted figures, perhaps made by spears thrown at the drawings. ■ But if improving their hunting luck was the chief motivation for the paintings, it is difficult to explain why only a few show signs of having been speared. ■ Perhaps the paintings were inspired by the need to increase the supply of animals. Cave art seems to have reached a peak toward the end of the Upper Paleolithic period, when the herds of game were decreasing. ■ Therefore, if the paintings were connected with hunting, some other explanation is needed.
做题方式
指代暗示：They OG 73 ▇The raising of livestock is a major economic activity in semiarid lands, where grasses are general the dominant type of natural vegetation. ▇The consequences of an excessive number of livestock grazing in an area are the reduction of the vegetation cover and the trampling and pulverization of the soil.▇ This is usually followed by the drying of the soil and accelerated erosion. ▇ Look at the four squares ▇ that indicate where the following sentence can be added to the passage. This economic reliance on livestock in certain regions makes large tracts of land susceptible to overgrazing. Where would the sentence best fit?
请找出最适合这句话的位置。
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句子插入题的句子形式：
Look at the four squares ▇ that indicate where the following sentence can be added to the passage. This is a question that has puzzled scientists for Where would the sentence best fit?
句子插入题 方法二. 三
段落结构暗示： 概述细节 作者写文章的顺序：先概括，后细节。
• Under very cold conditions, rocks can be shattered by ice and frost. Glaciers may form in permanently cold areas, a nd these slowly moving masses of ice cut out valleys, carr ying with them huge quantities of eroded rock debris. ■In dry areas the wind is the principal agent of erosion. ■ It carries fine particles of sand, which bombard exposed ro ck surfaces, thereby wearing them into yet more sand. ■ Even living things contribute to the formation of landscape s. ■Tree roots force their way into cracks in rocks and, in so doing, speed their splitting. In contrast, the roots of gra sses and other small plants may help to hold loose soil fra gments together, thereby helping to prevent erosion by th e wind. • Under different climatic conditions, another type of d estructive force contributes to erosion.