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.
【C10】
选项
答案N
解析 空格前是形容词higher，空格后是介词of，且分析句子结构可知，空格处的词处于一个由when引导的时间状语从句中，该从句缺少主语，因此，空格处应填入一个名词作句子主语。根据全文内容可知，当未来的奖励明显具有较高的价值或想象到将来取回食物的快乐时，人们才乐意做出一些规划，因此，N项value为答案。
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