higher 讲座中讲到保持型双语教育的缺陷:“One of the problems with maintenance programs is that they are more expensive than transitional programs

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答案higher

解析 讲座中讲到保持型双语教育的缺陷:“One of the problems with maintenance programs is that they are more expensive than transitional programs.”,即它要比过渡型双语教育费用更高,因此填入higher。
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