A．have been completedB．has been completedC．has complete……

单项选择题One of ______ most common illnesses in our society is time sickness , ______ sense of time pressure and hurry that causes anxiety and tension.

单项选择题This argument sounds reasonable, but ______ it’s incorrect.

单项选择题I must decline because the conditions you offered are not ______.

单项选择题It is clear that in modem society high ______ and demands are placed on teachers.

问答题隐形语法教学一般把语法现象藏在语言材料和语言活动之中，教师帮助学生通过听说读写的活动体验和练习语言，逐步习得其中的语法。这很像直接法，通过自然的途径学习语言。由于语言材料的编者有意识地将语法知识由浅入深系统地安排在语境之中，学生在活动中体验、感悟和重复那些含有新语法知识的语言材料，虽然没有翻译和解释，他们也能发现和归纳其中的规律。这就是归纳法。试述教师运用此种方法的优、缺点。