1、B 2、A, 3、A 4、A 6、A
worth 值得 be worth + n. 当名词为金钱时,表示"…… 值得……"
be worth doing sth. "……某事值得被做" ； worthy：be worthy of +n. 当名词为抽象名词时表示"……值得……"
be worthy to be done "某事值得被做" ；worth-while： be worth-while to do sth "值得做某事
value 指的是客观价值,具抽象意义
price 是某物的价格
prize是奖赏, 奖金,奖品
句子的主干是The bookis well worth reading. which are true stories about great scientists of 20th century 是修饰限定the book 的,这个句子没有倒装吧
it 是形式主语