已知双曲线C:$\frac{x^2}{4}-\frac{y^2}{5}=1$的左、右焦点分别为F₁、F₂，P为C的右支上一点，且|PF₂|=|F₁F₂|，则$\overrightarrow{P{F}_1}$$·$$\overrightarrow{P{F}_2}$等于（　　）

如图是小明观察洋葱根尖细胞分裂过程后绘制的示意图，分裂顺序正确的是（  ）

下列词语中划线的字，每对读音都不相同的一项是（     ）

选择合适的答语。
⑴Do you like socks? ____                 A. Honey(蜂蜜).
⑵What's Xiongda's favourite food?____   B. Music.
⑶What's his favourite subject?____       C. Brown is their favourite.
⑷Do you like to write stories?____      D. Yes，I also like to draw pictures.
⑸5. What's their favourite colour?____  E. No，I don't like socks.

如图，点E在BC上，AC∥BD，AC=BE，BC=BD．