关于下列细胞的相关叙述正确的是                                                       （   ）
①血小板              ②植物的导管        ③花粉                  ④木纤维
⑤精子                  ⑥颤藻                  ⑦水绵                  ⑧硝化细菌
⑨酵母菌               ⑩脂肪细胞

读图回答下题．

—Which of the two cameras are you going to buy?

— I'll buy______ of them because I want to give one to my best friend.

看一看、写一写。

went, cut, washed, fell, over

构建模式图，探究地理基本原理、过程、成因及规律，是学习地理的方法之一。读图判断下列说法正确的是：