Unit
5Revealing nature
>>>JICHU ZHISHI SHULI
>>>JICHU ZHISHI SHULI
基础知识梳理
构建知识体系
课标单词背诵
（先填后背）
seed
n.种子，籽
sample
n.样本goat
n.山羊primitive
adj.
原始的，低等的
root
n.根centimetre
n.厘米［单词拼写
运用］gieatei benefits
.Step 2.
衔接成文（利用适当的过渡衔接词语连句成篇）
Our ancestors learned about the characteristics of certain seeds in primitive times.
Nowadays,
agionomists have been doing leseaich on seed genetic vaiiation. There is no doubt that they do it so that they can cultivate new kinds of seeds and improve giain yield.
There ...