精选优质文档-倾情为你奉上IV. Explain the following terms(整理成简答或填空)1. Ferdinand de Saussure 2. Textual function 3. The London School of Linguistics 4. Surface structure 5. Transformational-Generative grammar 6. Language Acquisition Device(LAD) 7. Innateness hypothesisIII. Explain the following terms.1. Applied linguistics 2. Interlanguage3. Contrastive analysis 4. face validity 5. Error Analysis1. Define the following terms briefly.first language acquisition: behavior