【问】 This book is worth reading.

请问worth是个什么词?

【答】 《新英汉词典》认为worth是形容词，“用作表语，后接宾语”。国外的许多语言学家(如Curme等)也把worth看作是形容词。但R.Quirk等则认为worth具有介词的语法特征：支配名词短语、支配带逻辑主语的动名词以及what从句：

1. San Francisco is worth

旧金山值得经常参观。

2. The bicycle is not worth what you paid for it.

这辆自行车不值你付出的那么多钱。

请做下面的英语试题：

1. Only one of these books is____.

A. worth to read B. worth being read

C. worth of reading D. worth reading(全国高考英语试题，1986)

2. —What do you think of the book?

—Oh，excellent. It’s worth____a second time.

A. to read B. to be read

C.reading D.being read(全国高考英语试题，1989)