Unit4 Period3

学习目标： 1熟记和使用本节六个词组；2能熟练相关短语

自主合作探究：

6．exist vi.存在；生存

They laid eggs too and existed on the earth for more than 140 million years.(P26)

它们也生蛋，在地球上生存了一亿四千多万年。

归纳拓展：

①exist in存在于 exist on靠......生存

There exist(s)/existed...某地有/存在......

　　　　　　②existence n．存在；生存

come into existence开始存在；成立 in existence现存的；现有的

①There exists a tall tree in front of my home. 译：

小试牛刀： 用exist的适当形式填空

①He doesn't believe in the_______ _of ghosts.

②Did huge animals____ ___on the earth a long time ago?

7．give birth to产生；分娩

...because they gave birth to young baby animals and produced milk to feed them.(P26)

因为它们生出幼仔，用自己的母乳喂养。

归纳拓展： at birth出生时

by birth天生地；生来；在血统上

①Babies look the same at birth. 译：

②I'm a Chinese by birth. 译：

小试牛刀： 用birth的短语填空

①他说的话引起了一场争吵。

What he said_________ __a quarrel.

②据说杰克逊生来就是黑人。

Jackson was said to be a black man____ __.

8．in one's turn轮到某人；接着

Thus they have，in their turn，become the most important animals on the planet.(P26)