【单选题】― Why ______ you stay in the countryside, where it is not convenient to go shopping? ―But I’ve found it rather valuable for my health.
【单选题】― Why ______ you stay in the countryside, where it’s not convenient to go shopping? ―But I’ve found it rather valuable for my health.
【简答题】与基础工具相比,金融衍生工具有哪些特点?