试题题干
The 
Model is the center of Krashen’s second language learning theory.
参考答案
试题解析
The Monitor Model is the center of Krashen’s second language learning theory. 监控模型是克拉申第二语言学习理论的核心。
The Model is the center of Krashen’s second language learning theory.
The Monitor Model is the center of Krashen’s second language learning theory. 监控模型是克拉申第二语言学习理论的核心。