By 2012, the modern use of electronic educational technology (also called e-learning) had grown at 14 times of the rate of tra

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问题     By 2012, the modern use of electronic educational technology
(also called e-learning) had  grown at 14 times of the rate of traditional 【M1】________
learning. Open education is fast growing to become the dominant form
of education, for many reasons such as its efficiency and results compared to 【M2】________
traditional methods. However, cost of education has been an issue
throughout history and a major political issue in most countries today. Online
courses often can be expensive than face-to-face classes. Out of 182 colleges 【M3】________
surveyed nearly half said tuition for online courses were higher than that for 【M4】________
campus-based ones. Many large university institutions are now starting to offer
free or almost free full courses. It has been called the biggest change in the
way we learn for the beginning of the printing press. 【M5】________
    Despite of favorable studies on its effectiveness, many people still 【M6】________
desire to choose traditional campus education for social and cultural reasons.
The conventional merit-system degree is currently not common 【M7】________
in open education as it is in campus universities, although some open
universities do already offer conventional degrees. Presently, many
of the major open education resources offer their own form of certificate. 【M8】________
    Due to the popularity of open education, these new academic certificates
are raising more respect and equal status to traditional degrees. Many 【M9】________
open universities are working in offering students standardized testing 【M10】________
and traditional degrees and credentials.
【M3】

选项

答案∧expensive→more

解析 比较级缺失。该句含有than引导的比较状语,将online courses和face-to-face classes进行对比,句中缺少形容词expensive的比较级形式,故应在expensive前加上more。
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