练习材料：
Lesson 18-2 Porpoises
Porpoises and sharks are natural enemies. It is possible that upon such an occasion a battleensued, with the sharks being driven away or killed.
Whether it be bird, fish or beast, the porpoise is intrigued with anything that is alive. They are constantly after the turtles, who peacefully submit to all sorts of indignities. One young calf especially enjoyed raising a turtle to the surface with his snoutand then shoving him across the tank like an aquaplane. Almost any day a young porpoise may be seen trying to turn a 300-pound sea turtle over by sticking his snout under the edge of his shelland pushing up for dear life.
应用配置：L0+L4
知识笔记： ensued/ɪnˈsud driven/drɪvən intrigued/ɪntrigd indignities/ɪnˈdɪgnətiz calf/kæf snout/snaʊt aquaplane/aquaplane shell/ʃɛl
练习感悟：用时45分。今天的段落不长，读起来还算是轻松，生词不多。
