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Questions 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage. The speaker suggests the "Enigma Variations" because it is ______.
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Humanity’s primal (原始的) efforts to systematize the concepts of size, shapes, and number are usually regarded as the earliest mathematics. However, the concept of number and the counting process developed so long (67) the time of recorded history (there is archaeological (68) that counting was employed by humans as far back as 50,000 years ago) that the (69) of this development is largely conjectural (好推测的). Imaging how it probably came (70) is not difficult. The argument that humans, (71) in prehistoric times, had some number sense, at least (72) the extent of recognizing the concepts of more and less when some objects were (73) to or taken away from a small group, seems fair, for studies have shown that some animal possesses such a (74) . With the (75) evolution of society, simple counting became necessary. A tribe had to know how many members it had and how many enemies, and shepherd needed to know (76) the flock of sheep was decreasing in size. Probably the earliest way of keeping a count was by some simple tally (计算, 记录) method, (77) the principle of one-to-one corre-spondence. In (78) a count of sheep, for example, one finger per sheep could be (79) . Counts could also be (80) by making scratches in the dirt or on a stone, by cutting notches in a piece of wood, or by tying knots in a string. (81) , perhaps later, an assortment of vocal (82) was developed as a word tally against the number of objects in, a small group. And (83) later, with the development of writing, a set of (84) was invented to stand for these numbers. Such an imagined development is (85) by reports of anthropologists in their studies of present-day societies that are (86) to be similar to those of early humans.
Questions 22 to 23 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions, Now listen to the news. What is Chad worried about
Questions 4 to 6 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions. Now listen to the conversation. What will the man probably do before he departs for Beijing
Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage. The part of the statue that we can see on the outside was made by ______.
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