湖。

2．__________________ she had looked ahead and planned better this year!

她今年要是早有预见，计划得更好些就好了！

3．Abruptly she sat down，________________ by her laughing，shouting sister，Luna.

突然间她坐了下去，但又被她那又笑又叫的妹妹Luna一把搂了起来。

4．Our evidence ____________ they did wear clothes made from animal skins.

我们的证据表明他们确实穿了用动物皮做成的衣服。

1.as the botanical analyses have shown us　2.If only　3.only to be scooped up　4.suggests that

知识详解

1 .alternative　 adj.　供选择的；其他的　

n．　可能的选择；选择对象

(回归课本P37)Can you think of the alternatives we would use today?

你能想到我们今天可供利用的办法吗？

[归纳拓展]

[例句探源]

①(牛津P56)You can be paid in cash weekly or by cheque monthly；those are the two alternatives.

你的工资可以按周以现金支取，或按月以支票支取。二者可选其一。

②(牛津P56)We had no alternative but to fire him.

我们别无他法，只有辞退他。

③The way was blocked，so we went by an alternative road.

那条路被堵住了，所以我们走了另一条路。

[即境活用]

1．(2009年高考湖北卷)As there is less and less coal and oil，scientists are exploring new ways of making use of________energy，such as sunlight，wind and water for power and fuel.

A．primary　　　　　　B．alternative

C．instant D．unique

解析：选B。句意：由于煤和燃油越来越少，科学家们正在探索新的方法使用替代能源，像阳光，风和水等。primary"首要的，初期的"；instant"立即的，迅速的"；unique"独特的"；alternative"可选择的，可替代的"。

2 .assume 　v．　假定；设想；假装；承担

(回归课本P38)So we think it is reasonable to assume they lived in these caves，regardless of the cold.

因此我们有理由认为他们不顾严寒，就住在这些洞穴里。

[归纳拓展]

[例句探源]

①(牛津P104)It is reasonable to assume that the economy will continue to improve.

认为经济继续好转是有道理的。

②(牛津P104)Let us assume for a moment that the plan succeeds.

咱们暂时假设计划成功。