（2014·绍兴）下列有关水稻的说法不正确的是（    ）

设复数$z=\frac{1}{2}+\frac{\sqrt{3}}{2}i$，则$\frac{z}{\stackrel{-}{z}}=$（     ）

种子植物有两个基本特征：（1）体内有____ 组织，（2）能____  并用种子繁殖，根据种子外层是否有果皮包被，可分为____ 和被子植物．被子植物又可分为两类：叶多为平行脉，花瓣为3或3的倍数的为____ 植物，叶多为网状脉，花瓣为4、5或4、5的倍数的为____  植物．

W：How are you?

M₁：I'm ____. What's wrong with you?

W：I want to send an ____. But I don't have a computer.

M₁：You can ask your teacher to help you.

W：Good ____！

W：Hello，Mr. Li. Could I use your computer?

M₂：Sure. It's there on your ____.

W：Thanks，Mr. Li. It's very ____ of you.

M₂：You're welcome.