2. 外语
  3. A. ability B. access C. admired D. allowed E. basically F. consuming G. current H. hiding I. includes J. motivation K. obv

A. ability B. access C. admired D. allowed E. basically F. consuming G. current H. hiding I. includes J. motivation K. obv

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问题    A. ability B. access C. admired D. allowed E. basically
   F. consuming G. current H. hiding I. includes J. motivation
   K. obvious L. passion M. premise N. value O. wisely
   The phrase bird-brain may be used to describe someone being silly, but this is not the case for ravens. Long 【C1】______for their intelligence, ravens are now known to be able to plan ahead, a skill previously thought to belong only to humans. Researchers learned ravens could remember key information for a future task through tests. Until now, some corvids—the family of birds that 【C2】______ravens—have shown the【C3】______to plan beyond the present, for example by 【C4】______food for later.
   But the latest experiments revealed that ravens can 【C5】______forego an immediate reward in order to get a better one in the future. In one of the tests, ravens were trained to use a tool to open a puzzle box in order to 【C6】______a reward. And then, the ravens were presented with a tool to open a box and an immediate reward, but were only 【C7】______to choose one or the other. Ravens remembered that the reward in the box was better than the immediate reward, and almost all of them chose the tool.
   Ravens’ 【C8】______for planning is still unknown, but it may be similar to ours. The human brain stores memories of past events to guide decision-making about 【C9】______and future events. Planning tends to come about when the higher 【C10】______of a future reward is palpable, or when one imagines the happiness that will come by retrieving food in the future.
【C1】
选项
答案C
解析 分析空格所在句的句子结构可知，前半句为一个非谓语动词结构作状语，故空格处需要填入一个非谓语动词，且该动词能与for搭配使用。根据后半句可知，渡鸦能够计划未来，而这是过去被认为只有人类才具备的技能，因此，渡鸦的这项技能令人赞叹，故C项admired为答案。
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