2. 外语
  3. Before considering this question it is interesting to review briefly the evolution of the mind as 【M

Before considering this question it is interesting to review briefly the evolution of the mind as 【M

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问题    Before considering this question it is interesting to
review briefly the evolution of the mind as                            【M1】_____
the instrument. The commonest way that has been used to find out the relative intellectual level of
creatures at different stage of evolutionary complexity
has been to study the Way they behave when                             【M2】_____
giving different kinds of puzzles. For example,
an ant possesses a complex routine of behaviour, but                    【M3】_____
can it think? The answer is what if an ant is forced to
go through a maze of passages, many of which                            【M4】_____
are dead ends, on its way to its nestle,
it starts by making a lot of mistakes and taking a great many           【M5】_____
wrong turnings. In the end, however,
after it has to worry its way through often enough, it does learn       【M6】_____
to get to its nest without going into any of the blind alleys. As one moves up the evolutionary scale the test of mind-power exemplified by
solving the problem of getting through a maze becomes                   【M7】_____
very simple. Among mammals, for example,
the maze is an inadequate test. The learning problem                    【M8】_____
does not tax enough attributes of the mind. In this sort of learning, as a matter of fact, rats can hit
university undergraduates and have,
in fact, repeatedly done so. The next, more subtle test of mental       【M9】_____
ability is to see what level an animal
can think about something when it is not there.                         【M10】_____
【M6】
选项
答案has ∧ to改成had
解析 has是现在完成时的助动词，后面还应跟一个动词have的完成时态had。
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