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.
【C7】
选项
答案D
解析 空格前后构成被动语态结构，且空格前已有被动语态助动词were，因此，空格处应填入一个动词的过去分词形式。空格后提到，渡鸦记得盒子里的奖励比眼前这个奖励要好，所以几乎都选择了开盒子的工具，因此，此处是说研究人员只允许渡鸦选择其中一个，故D项allowed为答案。
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