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Of all the goals of the education reform movement, none is more difficult than developing an objective method to assess teachers

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问题     Of all the goals of the education reform movement, none is more difficult than developing an objective method to assess teachers. Studies show that over time, test scores do not provide a【C1】______ means of separating good from bad instructors.
    Test scores are an【C2】______ indicator of quality because too many factors outside of the teachers’ control can influence student【C3】______ from year to year—or even from classroom to classroom during the same year. Often, more than half of those teachers【C4】______ as the poorest performers one year will be judged average or above average the next, and the results are【C5】______ as bad for teachers with【C6】______ classes during the same year.
    【C7】______, there’s a far more direct approach: measuring the amount of【C8】______ a teacher spends delivering relevant instruction—【C9】______, how much teaching a teacher actually gets done in a school day.
    This is hardly a new【C10】______. Thirty years ago two studies using this approach found that some teachers were able to deliver【C11】______ 14 more weeks a year of relevant instruction than their less efficient【C12】______.
    There was no【C13】______ to their success: it was obvious that the efficient teachers【C14】______ strictly to the curriculum, maintained stern discipline and【C15】______ non-instructional activities, like【C16】______ unessential classroom business when they【C17】______ focused on the curriculum.
    And both studies found that the teachers who【C18】______ more were also the teachers who【C19】______ students who performed well on【C20】______ tests.
【C9】
选项 A、in a word
B、by the way
C、in other words
D、in addition
答案C
解析 句意关系题。根据分析句子结构，破折号之后的部分是对前面部分的补充解释，措辞比前面部分更加简单，但意思大致和前面部分一样，可知要选C项，in other words“换句话来说”。in a word“简而言之”，对前文做一个非常简短的总结，但破折号之后的部分并非总结，所以可排除A项;by the way“附带的”和in addition“除此之外”均用于引出一个新的相关话题，但破折号后面的部分没有新信息。所以可排除B和D项。
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