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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 (1)______ means of separating good from bad instructors.
    Test scores are an(2)______ indicator of quality because too many factors outside of the teachers’ control can influence student(3)______ from year to year—or even from classroom to classroom during the same year. Often, more than half of those teachers (4)______ as the poorest performers one year will be judged average or above average the next, and the results are(5)______ as bad for teachers with (6)______ classes during the same year.
     (7)______, there’s a far more direct approach: measuring the amount of (8)______ a teacher spends delivering relevant instruction—(9)______, how much teaching a teacher actually gets done in a school day.
    This is hardly a new(10)______. Thirty years ago two studies using this approach found that some teachers were able to deliver(11)______ 14 more weeks a year of relevant instruction than their less efficient(12)______.
    There was no(13)______ to their success: it was obvious that the efficient teachers(14)______ strictly to the curriculum, maintained stern discipline and(15)______ non-instructional activities, like(16)______ unessential classroom business when they(17)______ focused on the curriculum.
    And both studies found that the teachers who(18)______ more were also the teachers who(19)______ students who performed well on(20)______ tests.
(9)
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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