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.
【C8】
选项
答案J
解析 空格前是名词所有格Ravens’，空格后是介词结构，且分析句子结构可知，本句缺少主语，因此，空格处应填入一个名词作句子主语。通读下文内容可知，本段主要讲述了人类为将来做计划的动机，而空格所在句的后半句提到，渡鸦的情况可能与人类相似。由此推测，此处是说渡鸦安排计划的动机不得而知，故J项motivation为答案。
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