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【自主梳理】1. Turn to Page 97 and finish 1a .
2. Turn to page 99 , read the passage and finish exercises on Pa ge 99.
3. Check answers.
【重点领悟】
Studying useful words and expressions.
① co st v价钱为,花费 n.价钱,代价;花费,费用
The cost of a loaf of bread has increased five-fold.. 一条面包的价钱增长了4倍。
Badges are also available at a cost of £2.50. 徽章也有卖的,2.5英镑一枚。
It's going to cost me over $100,000 to buy new trucks.
买几辆新卡车将花掉我10万多美元。
② harmful adj.对…有害的 ;能造成损害的;不利;不良
Smoking is harmful to our health.
吸烟对人类的健康有害。
③ used to do过去一向,过去时常,过去曾(而现在不再)做
Who used to do your laundry? 谁过去一直为你洗衣服?
She used to wash dishes in a restaurant.她曾经在餐馆 里洗过盘子。
④ afford vt.买得起;担负得起;提供;给予
We couldn't afford to buy a new car. 我们买不起新的车。
We can't afford to wait. 我们等不起。
My parents can't even afford a new refrigerator.
我父母甚至买不起一台新冰箱。
⑤ play a part in扮演某角色; 与…有关,对…有影响
I'd like to play a part in their discussion. 我愿意参与他们的讨论。
Educ ation is playin g a big part in environmental protection.
教育在环境保护中起着很大作用。
He played a part in his favorite TV show.
他在他最喜欢的电视节目中扮演了一个角色。
【探究提升】
① cost
表花费时, 主语为_____.