根毛是（）。
A、毛状的不定根
B、根表皮细胞分裂产生的突起
C、表皮毛
D、表皮细胞外壁突起伸长的结果
参考答案：D
To have a family reunion dinner at a restaurant, you need to reserve the restaurant and select
dishes on the menu months before it,____? [ ]
A. don't you
B. didn't you
C. mustn't you
D. needn't you
