命妇服装的六种礼服的前三种是：（）、（）、（）
参考答案：袆衣；揄狄；屈狄
下列哪组生物和无机环境组成一个生态系统？[ ]
A．藻类、鸟
B．大量的小鱼、大鱼
C．虾、藻类
D．昆虫、小草、细菌
"Well done!" the teacher patted the shoulder of the student, _____ with a smile on his face. [ ]
A. satisfied
B. being satisfied
C. having satisfied
D. satisfying
