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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.
【C1】
选项 A、persistent
B、consistent
C、continuous
D、useful
答案B
解析 词义辨析题。有两处提示，一个是这句话的时间状语over time“长期来说”，说明相关的测试方法必须是长期适用，且连贯一致的；另一个是第二段第二句话提到，超过一半得到差评的老师在下一年会被评为中等或优于中等，可见旧的测试方法无法保持前后一致。所以选B项，consistent“前后一致的，连贯一致的”。persistent“坚持不懈的，持续不断的”，当用于持续不断之意时，常用于指令人不愉快的感觉或状况，比如persistent rumors“持久的谣言”，所以可排除该项。continuous“继续不停的；不间断的”，重点强调不间断的状态，没有始终保持一致的意思，所以可排除。
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