托福阅读句子插入题21

　　托福阅读中句子插入题是重要题型之一。根据托福阅读题型不同来进行专项练习，是短期提高托福阅读能力的有效方法。同学们需要多加练习哦!

　　托福阅读句子插入题：Cave Art in Europe

　　【Paragraph 3】The subjects of the paintings are mostly animals. The paintings rest on bare walls, with nobackdrops or environmental trappings. Perhaps, like many contemporary peoples, Upper Paleolithic men and women believed that the drawing of a human image could cause death or injury, and if that were indeed their belief, it might explain why human figures are rarely depicted in cave art. 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. ■(Cave Art in Europe)

　　Look at the four squares [■] that indicate where the following sentence could be added to the passage.

　　Therefore, if the paintings were connected with hunting, some other explanation is needed.

　　Where would the sentence best fit?