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

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

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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.
【C6】
选项
答案B
解析 分析空格所在句的句子结构可知，空格处是in order to do sth. 结构，且空格后有宾语a reward，因此，空格处应填入一个及物动词的原形。此处提到的是研究人员为了证明渡鸦会明智地放弃即时奖励从而获得更好的奖励而进行的一项实验。因此，研究人员训练渡鸦使用工具打开机关盒的目的就是让渡鸦获得奖励，故B项access为答案。
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