【单选题】Paper is made of _____bamboo.
【单选题】公共经济学将利益集体或个人通过影响公共选择和决策为己谋利的行为称为
【单选题】Linda used ______long hair. Now she has short hair.
【单选题】Sam _____ lots of chocolate _____ yesterday. [ ]
【单选题】Books are usually made ____ paper, while paper sometimes made ____ bamboo.