10．After three months of hard work，my son managed to ________ his classmates in math.$来&源：

A．be ahead of B．ahead of

C．over D．the head of

答案　A

解析　to为不定式符号，后面必须有动词，故选A项。

Ⅱ.阅读理解

　　Have you heard the old expression "One man's trash is another man's treasure"？Elizabeth Gibson believes it，because she is living proof of the old adage(格言)．

　　A 53­year­old woman was walking down the street on Manhattan's Upper West Side four years ago when something lying in a pile of trash on the street caught her eyes.It turned out to be a painting，which she was sure didn't belong there，although she was far from an art critic.Gibson took it home and hung it on a wall."It was huge and very brightly colored，very abstract，but you could make out three figures and it was just very powerful，" she said.

　　Her research led her to a website and a shocking discovery：the painting was a 1970 effort-called Three People-by a Mexican artist named Rufino Tamayo，who died in 1991 and，as so often happens in the art world，the value of his work had skyrocketed.It is now estimated to be worth up to 1 million.

　　Authorities at Sotheby's auction house say that the painting was stolen from their warehouse in 1987！Ten years before，a Houston man purchased it for 55,000 as a gift for his wife.The owners even offered a 15,000 reward，but for years，no one knew what had happened to it，until Gibson walked down that street.

　　In addition to an unknown percentage of the sale of the painting by its owner，Gibson will also receive the 15,000 reward.Gibson was truly in the right place at the right time.A doorman who saw her pick up the painting recalls that garbage collectors came by the area just 20 minutes after she found it.

1．The author mentions the old saying "One man's trash is another man's treasure" to ________.

A．suggest that readers can also find treasure in trash，just as Gibson did

B．explain his understanding of it and talk about Gibson's story

C．introduce the topic for further discussion later on on the passage

D．prove that good luck plays an important role in making one rich

答案　C

解析　推理判断题。全文主要围绕Gibson在垃圾堆中捡到一幅价值不菲的油画这一事件展开的，因此可推知，第一段中作者提起那句谚语的目的在于导入本文的话题。

2．The underlined word "skyrocketed" in Paragraph 3 probably means "________"．资*源%库

A．changed quickly B．existed continuously