In a communicative language teaching context the teacher "does" (0) (A) provide roughly-tuned language input !!! (0) (B) conduct a direct test to measure the learners’ oral abilities (0) (C) engage learners in authentic use of language for meaningful purposes !!!(X) (D) encourage fluency at the expense of clear, unambiguous communication 關於正答(D)選項: "at the expense" 大約是損壞的意思?? 以下解釋看不太懂 誠徵解惑人 ><|| (1) at the expense of someone or something Fig. to the detriment of someone or something; to the harm of someone or something. He had a good laugh at the expense of his brother. He took a job in a better place at the expense of a larger income. (2)at the expense of something with the loss of something Time is spent preparing students for state tests at the expense of other, important instruction. (http://idioms.thefreedictionary.com/at+the+expense+of 及紙本字典) (3) if one thing exists or happens at the expense of another, the second thing suffers or is not done properly because of the fist ex: Military strength is often achieved at the expense of a country's economic health. (不懂....Orz) 另外，選項..