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plastic bag 21 ? seed n. 種子 seed corn 22 ? society n. 社會 Many retired people can still contribute to the society with their rich experience. 許多退休的老人還能用他們豐富的經(jīng)驗為社會作貢獻。 23 ? unhappy adj. 不開心的, 不幸福的, 難過的 look unhappy 24 ? useless adj. 無用的, 廢舊的 a useless puter 25 ? worth adj. 有 …… 的價值, 值得 …… 的 ? The book is worth reading. ? It’s an idea that’s worth considering. ? It’s not worth the effort. Our house is worth about 167。 60,000. ? I paid only 167。 3,000 for this used car but it’s worth a lot more.