日日人人_亚洲美女在线视频_av手机在线播放_国产大片aaa_欧美中文日韩_午夜理伦三级

Each member of ______ Green Peace Club is required to gain _____ better understanding of their system.

　 A. the; the　　　　 B. the; a　　　　　 C. /; a　　　　　 D. /; /