2. 外语
  3. Before considering this question it is interesting to review briefly the evolution of the 【M1】______

Before considering this question it is interesting to review briefly the evolution of the 【M1】______

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问题     Before considering this question it is interesting to
review briefly the evolution of the                            【M1】______
mind as 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                            【M2】______
study the way they behave when giving different kinds of puzzles.
For example, an ant                                            【M3】______
possesses a complex routine of behaviour, but can it think?
The answer is what if an ant is                                【M4】______
forced to go through a maze of passages, many of which are dead ends, on its way to its
nestle, it starts by making a lot of mistakes and
taking a great many wrong turnings. In the                     【M5】______
end, however, after it has to worry its way through
often enough, it does learn to get to its                      【M6】______
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 be-              【M7】______
comes very simple. Among mammals, for example,
the maze is an inadequate test. The                            【M8】______
learning problem 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.                                   【M9】______
The next, more subtle test of mental ability is to see
what level an animal can think about                           【M10】______
something when it is not there.
【M2】
选项
答案stage改成stages。
解析 意思是不同的阶段，是复数概念。
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