一、教学目标：
1. 语言知识目标
基本词汇：litter, bottom, fisherman, coal, ugly, advantage, cost,
wooden, plastic, takeaway, bin, shark, fin, cruel, harmful,
chain, ecosystem, industry, law, scientific, afford,
reusable, transportation, recycle, napkin, upside, gate,
bottle, president, inspiration, iron, work, metal,
creativity,
基本词组：be harmful to, at the top(of sth.), take part in, turn off, pay
for, take action, throw away, put sth. to good use, pull…
down, bring back
基本句型：We’re trying to save the earth.
The river used to be so clean.
The air is badly polluted.
No scientific studies have showed that shark fins are
good for health.
We should help save the sharks.
