群体中的动物之间进行交流信息的方式有:用 、 或 等方式进行交流。
声音 动作 气味
— How about going to school by boat, Lilei?
— Good idea. That must be ______ than taking a bus. [ ]
A. much fun
B. more much fun
C. a lot more fun
D. funner
试述货币政策与财政政策协调配合的必要性。