For most learners, skill learning begins with the cognitive stage. During this stage, the learners are instructed how to do the

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问题     For most learners, skill learning begins with the cognitive stage. During
this stage, the learners are instructed how to do the task, observe an expert
performing the task, or attempt to figure it up and study it themselves. This       【M1】______
stage involves conscious activity on the part of the learner, and the acquired
knowledge at this stage is typical declarative and can be described verbally by the 【M2】______
learner. For instance, one can memorize vocabulary and the rules for grammar
when learning to speak a second language, or learn after observation when to use    【M3】______
unanalyzed chuck of language appropriately, just as one can memorize any other      【M4】______
set of facts. This knowledge enables the learner to describe how to communicate
in the second language, as the knowledge by itself is inadequate for skilled        【M5】______
performance, since the performance at this stage is very deliberate and tends to
be laden with the errors. Then after some period of practice, we come to the        【M6】______
next stage—the associative stage, during which two main changes incur              【M7】______
with respect to the development of proficiency in the skill. First, errors in
the original  declarative  representation of the stored  information are
gradually detected and eliminated. Second,  the connection among the                【M8】______
various elements or components of the skill are strengthened. Basically,
during this stage the declarative knowledge is turned into their procedural         【M9】______
form. However, the declarative representation initially formed is not always
lost. Thus, even as we become fluent at speaking a foreign language, we             【M10】______
still remember its rules of grammar.
【M4】

选项

答案∧unanalyzed→an

解析 冠词缺失。句中chunk表示“一块,一部分”,是可数名词,应该与冠词一起使用,此处是初次提到“未经分析的语言成分”,前面加不定冠词.因为修饰chunk的形容词unanalyzed以元音因素为首,所以添加不定冠词an。
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