8A Unit 3 MainTask教学案学习目标:选择、组织并呈现信息。识别关键信息并将其归类,计划一次外出郊游。写信邀请朋友外出郊游。学习重难点:学习过程:I’m going to exercise. (1)exercise v. 锻炼Ex. You need to exercise to keep fit.(2)exercise n. 锻炼(不可数);练习题(可数)Ex. The old man often does some exercise after supper. Your math is a little poor. You need do more exercise, I think2.Take a boat trip == have a boat trip, go on a boat tripE.x. Next Sunday, I&..