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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
admin
2021-02-21
42
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.
【C2】
选项
答案
I
解析
分析空格所在句的句子结构可知,空格所在句包含一个由that引导的定语从句,该从句缺少谓语,因此,空格处应该填入一个动词作从句谓语。空格前面提到了corvids“鸦科鸟类”,空格后提到了ravens“渡鸦”,由此不难推断此处是说包括渡鸦在内的鸦科鸟类,故I项includes为答案。
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0
专业英语四级
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