last week recovered the family heirloom(传家宝) after tracking down the garbage truck and searching through 10 tons of city trash bags.

　　Joan Sawyer of Bedford said all her efforts paid_off after realizing she had dropped her diamond ring into her single trash bag among thousands of others.

　　"I was in total panic，"Mrs Sawyer told WHDH­TV，saying she thought she'd never see the heirloom again.

　　Her diamond ring dropped by accident in the trash can and she only realized after a dump truck had made a stop at their house.

　　"I said，'Oh my God，it's in the rubbish truck，'"Mrs Sawyer recalled before calling the Allied Waste Service.

　　Allied Waste Service was able to find the truck number exactly that had come to their door and tell them where it was heading.

　　Mrs Sawyer and her husband waited for three hours watching out for her 24－44 truck to arrive.

　　But to their mixed relief，it arrived，emptying 10 tons of trash in a room.Lucky enough to have the voluntary aid of Covanta workers who helped the Sawyers pick through the large amounts of black trash bags and other wastes，as her husband Bill Sawyer described，the crew didn't have a rest until they found something glittering.

　　"I said，'Oh my God，that's my bag，I recognize something in it，'"Mrs Sawyer recalled.

　　Mr Sawyer began to tear the trash bag apart，and there，it appeared.

　　"You could almost see the tears in her eyes；she was excited when she found it，"Ken Nydam of Covanta told WHDH­TV.

　　"And then everyone who helped out，they were just happy they got to see how happy she was and we were happy we could help them out，"he added.

　　【语篇导读】　美国马萨诸塞州的一位女士上周误将自己的一枚钻石戒指丢掉，在追着垃圾车翻遍10吨的城市垃圾后终于找回了她的这一传家珍宝。

20．What's the main idea of the passage?

　　A．How did Mrs Sawyer find her diamond ring?

　　B．A diamond ring was recovered in 10 tons of trash.

　　C．A diamond ring dropped by accident in the trash can.

　　D．Many hands make light work.

答案 B [主旨大意题。本文是一篇新闻报道。这种题材的文章中心一般出现在首段。故B项合适。其余A，C，D都是细节，不合适。]

21．What kind of help did Allied Waste Service offer?

A．Helping find out the exact trash truck.