④________ will I give in to the difficulty.

3．unlike prep.& adj.不同，不像，相异

Water had also appeared on other planets like Mars but，unlike the earth，it had disappeared later.(P26)

在火星等其他行星上都出现了水，但和地球不同的是，这些水后来消失了。

归纳拓展：

①It's unlike sb.to do sth.做某事不像某人平常的样子

②unlikely adj.不大可能发生的 sb./sth.be likely to do sth.可能...=It is likely that...句型

③like v.喜欢 (like to do / doing) prep.像

dislike ：不喜欢 unlike 不像 likely adj.可能的

It's very unlike him to leave without saying a word.

译：

小试牛刀： 用unlikely/likely/unlike/like填空

①They are so______ that nobody believes they are sisters.

②Since their parents strongly disagree，they are______ _to marry.

③He is more_____ __his mother than his father.

4．fundamental adj.根本的；基本的；基础的；必不可少的

It was not immediately obvious that water was to be fundamental to the development of life.(P26) 水对于生命的发展会起到关键作用这一点并没有立即明朗化。

归纳拓展：

be fundamental to...是......的基础；对......必不可少 fundamentally adv.根本上；完全地

小试牛刀 用fundamental的适当形式填空

①Soil is______________to the growth of the plants.

②What he did is_________________different from what he said.

5．This produced a chain reaction，which made it possible for life to develop.(P26)

这就产生了一种连锁反应，使得生命的发展成为可能。

George made it clear that he disagreed.乔治表示得很清楚了，他不同意。

I felt it my duty to change all that. 我认为改变这一切是我的责任。

I find it hard to remember these words in a short time. 我发现在短时间内记住这些词很难

自我探究：