答案：We fired our guns at the enemy.

________________________________________________________

【经典例句】 As we grow older,we learn the limits of our abilities.

随着我们长大,我们了解了我们能力的限度。

The teacher limited his students to 500 words for their compositions.

老师把学生的作文限制在五百字以内。

【考点聚焦】 1）同根词：limited adj.有限的;少的；limitation n.限制，局限性

2)limit作名词"......的限度"讲时，作动词"限制......在某种程度"讲时都与介词to连用。如：

Is there any limit to the time that I stay here？

我在这儿待的时间有限制吗？

In this area you must limit your speed to 30 kilometers an hour.

在这个区域你必须把速度限制在每小时30公里以内。

3）limit和limitation的区别：

limit 可指有形的或者无形的（如时间、智力、权利方面）限制。

limitation 着重强调"能力的缺陷和局限性"。

【巧记提示】 out(外面的)+door(门)

【经典例句】 The children played outdoors until it started to rain.

孩子们在户外玩耍直到天下起雨来。

The old should walk outdoors for fresh air in the spring.

在春天，老人们应该走到户外去呼吸新鲜空气。

【考点聚焦】 1）同根词：outdoor adj.户外的；露天的；反义词：indoors adv. 在户内

2）outdoors与indoors都是副词，不能作定语；outdoor与 indoor都是形容词，只能作定语。

【活学活用】 6.完成句子

I saw her coming in________（从室外).

答案:from the outdoors

【巧记提示】 charge(费用)change（找回的零钱）

【经典例句】 The charge for admission is US$ 5.

入场费五美元。

【考点聚焦】

1）free of charge（=at no cost）免费。如：

Delivery is free of charge if goods are paid for in advance.

如预付货款就可免费送货。

2）in charge of 负责，掌管；in the charge of 在......掌管下；由......负责。如：

The teacher who is in charge of a class is called a headteacher.

负责一个班的老师叫班主任。

3）charge（sb.）for sth./doing sth.因为某事(做某事)(向某人)索价......。如: