A:受精卵
B:囊胚
C:八细胞胚
D:原肠胚
① make a card ____ A. 给她讲—个故事
② write her a letter ____ B. 制作—张卡片
③ play the pipa for her ____ C. 给她写—封信
④ tell her a story____ D. 为她弹琵琶