What is the little girl doing?
A. Chating on line with her friend.
B. Watching her favorite TV program.
C. Singing Karaoke.
D. Playing computer game.
Where is the little girl?
A. She's at the class room.
B. She's at an internet bar.
C. She's at her mother's office.
D. She's at home.
胚泡开始植入的时间大约相当于月经周期的第几天
A. 第11~12天
B. 第20~21天
C. 第6~7天
D. 第14天