If the small-brained australopithecines were not toolmakers, what evolutionary advantage did they gain by walking upright? (Line 50) One theory is that bipedality evolved in conjunction with the nuclear family: monogamous parents cooperating to care for their offspring. Walking upright permitted the father to use his hands to gather food and carry it to his mate from a distance, allowing the mother to devote more time and energy to nurturing and protecting their children. According to this view, the transition to bipedal walking may have occurred as long as ten million years ago, at the time of the earliest hominids, making it a crucial initiating event in human evolution.
20: the passage suggests that proponents of the theory mentioned in lines 50-54 (One theory is … offspring) assume that which of the following steps in human evolution occurred most recently?
A: development of a nuclear family structure
B: transition from walking on all fours to walking upright
C: dramatic enlargement of the brain
D: use of the hands to gather and carry food
E: modification of propulsive muscles to provide stability and control in locomotion
21: the passage suggests that, in comparison with the hominid australopithecines, modern humans are
A: less well adapted to large group cooperation
B: less well adapted to walking upright
C: more agile in running and climbing
D: more well suited to a nuclear family structure
E: more well suited to cooperative caring for their offspring
22: According to the passage, the hominid australopithecine most closely resembled a modern human with respect to which of the following characteristics?
A: brain size
B: tool making ability
C: shape of the pelvis
D: method of locomotion
E: preference for certain foods
23: the primary purpose of the passage is to
A: present an interpretation of the chronological relationship between bipedal locomotion and certain other key aspects of human evolution
B: compare the evolutionary advantages and disadvantages of bipedal locomotion to those of quadrupedal locomotion
C: argue that the transition to a nuclear family structure was a more crucial step in human evolution than was the development of stone tools
D: analyze anatomical evidence of bipedal locomotion to show that the large brain of modern humans developed at a later stage of evolution than was previously believed
E: use examples of muscle and bone structure to illustrate the evolutionary differences between modern humans, australopithecines, and chimpanzees
这片阅读感觉可以读懂，选项也很明白，可就是选不对,请NN指点：）
我的答案是CBCA
第22题，找到了定位在红字，可是为什么大家选D?不明白
还有最后一题主旨体不太明白，谢谢：）
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发表于 2005-11-5 04:10:00
