题目内容：
根据文章，回答题
According to the passage，NCLB mainly aimed to
[A] provide tests for pupils on maths and reading from third to eighth grade.
[B] add some science testing in schools for pupils aged from 8 to 13.
[C] enhance teaching standards which schools should be responsible for meeting.
[D] transfer pupils in failing schools to a better one or get them some tutoring.
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答案解析：