—______is your grandmother?
—She's in my home. [ ]
A. How
B. Where
C. What
D. Which
答案:B
蓝藻的遗传物质分布的特定区域称为[ ]
A.细胞质
B.细胞核
C.拟核
D.核糖体
常用硅酸盐材料包括()
A.水泥
B.塑料
C.纤维
D.陶瓷
E.橡胶