【即时巩固】Some insects take on the colour of their ____________ to protect themselves.

　　②房子的四周有高墙。The house was ____________ by high walls.

　　③周围的农田渐渐变成了住宅区。Gradually the ____________ farmland turned residential.

　　考点-2. cost

　　【教材原句】In 1998, a small accident during one of her practice vaults at the Good will Games could have cost her future happiness. (P19)1998年在友好运动会上进行跳马练习时出的一起小事故，原来可能会把好刀 未来的幸福化为泡影。

　　【例句研读】部分The man’s rude behavior cost him his job.

　　②Careless driving cost him his life.

　　③The book cost me 5 dollars.

　　④We made two mistakes that cost us dearly.

　　⑤We must reduce the production cost. 

　　⑥The soldier saved the little girl from the fire at the cost of his life.

　　【自主归纳】/劳动等

　　使某人丢了工作/生命

　　使某人付出高昂的代价

　　以……为代价

　　=

　　注意：cost, pay, buy, spend在用法或搭配上的不同。

　　【即时巩固】①—Oh , you painted the walls yourself?

　　—Yes. It was not hard . The whole work didn’t ________ much .

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