Section B(1a-1e),任务一,任务二,任务一:把方框内的单词或短语按要求归类。 salt orange sugar biscuit crispy sweet sour salty,biscuit,sugar,orange,salt,任务一,任务二,任务二:有许多东西都是在无意之中发现(明)的,如茶、薯条。你还知道哪些呢?请搜集整理,与同学们分享。,答案：略,Potato chips were invented by mistake. 薯条是在无意中发明的。 by mistake是介词短语,意为“错误地;无意中”。如: John took my umbrella by mistake. 约翰错拿了我的雨伞。,辨析 by mistake与by accident,
