As head of the National Education Association in 1965-66, Elizabeth Duncan Koont

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问题 As head of the National Education Association in 1965-66, Elizabeth Duncan Koontz advocated higher salaries for teachers because she believed that the more______ teaching is, the greater its attraction for highly qualified people.

选项

答案 D,F

解析 because说明前后同义重复。空格与higher salaries(更高的薪水)同义重复。precarious不稳定的,dubious不稳定的,controversial有争议的,lucrative有利的,productive丰富的,profitable有利的。答案选DF注:这里precarious和dubious是干扰项,同表示“不稳定的”。
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