Languists often use the term native language or morther tongue instead of first language, and t_____ language instead of second language in second language acquisition literarture.
出自:信阳师范大学英语语言学

完成拼图验证

按住下方滑块,将拼图拖到缺口处后松开。

拼图背景,将小拼图拖到缺口处
向右拖动滑块