菠菜细胞有而人的口腔上皮细胞没有的结构是 [ ]
A.细胞膜
B.细胞质
C.细胞核
D.叶绿体
答案:D
Form the sentences. 连词成句。
1. does, Danny, what, to, do, like
?
2. She, to, on, computer, likes, play, the
.
3. like, I, play, to, basketball, my, with, father
解下列方程:
(1)1-2x=x;
(2)2x+5=3(x-1).