试题题干
Which of the following words has the different meaning from the others? （ ）
参考答案
正确答案：
试题解析
上述词语中，"L1","mother tongue"和"native language"指的都是第一语言，也就是母语。而"second language"是第二语言，和"L2","foreign language","target language"所指相同。