1.p171的 This incident represents a case where I would call the police.为什么是错的呢？是因为where不能指代case这样的抽象名词吗？ 2.p169的 As many as or more than 250 newspapers are published here.之前论坛上的帖子看作是wordy，那应该怎么改呀~ 3.p169的 This newspaper cost 50 cents as much as that one. 错误的地方到底是哪里呢？首先cost应该是加s，as much as这里的用法有错吗？