_______

Keys: 1). lost his balance 2). keep your balance 3). We must balance the advantages against the disadvantages before we decide.

2. curiosity n. 好奇心 curious adj. 好奇的 curiously adv. 好奇地

[典例]

1). Children have a natural curiosity about the world around them. 小孩子对他们周围的世界有着天生的好奇心。

2). I opened the packet just to satisfy my curiosity. 我打开包裹只是为了满足我的好奇心。

[重点用法]

out of curiosity 出于好奇 with curiosity = curiously好奇地

be curious about sth. 对某事好奇 be curious to do sth. 好奇地做某事

[练习] 用curiousity的短语或其适当形式填空。

1). Margaret looked at him _______ _______.

2). She decided to try a cigarette _______ _______ _______.

3). All the employees in this firm _______ _______ ______ the personal life of the general manager.

4). ________ enough, he had never seen the little girl.

3). ________ drove Mary to open her husband' s letter though she knew it was wrong.

Keys: 1). with curiosity 2). out of curiosity 3). are curious about 4). Curiously 5). Curiosity

3. limit vt. 限制；限定 n. 界限；限度 limited adj. 有限的 limitless adj. 无限制的

[典例]

1). The speed limit on this road is 70 mph. 这条路的车速限制是每小时70英里。

2). We must try and limit our expenditure. 我们必须设法限制我们的开支。

3). There' s a limit to how much I' m prepared to spend. 我准备花多少钱是有限度的。

[短语归纳] limit短语：

limit sb./sth. to... 限制某人/某事到某种程度 put a limit on... 对......限制

there is a limit to对......是有限的 without limit 无限地，无限制地

[练习] 用limit的短语或其适当形式填空。

1). One's energy is ______.

2). ______ ______ ______ ______ (没有止境) what you can do if you try.

3). We must _______ our weekly expenditure ______ ten pounds.

4). Only a _______ number of places are available.

Keys: 1). limited 2). There' s no limit to 3). limit; to 4). limited

4. benefit vt. 有益于 vi. 得益于（常与from, by连用） n. 利益，好处；津贴

1). The rain benefits the plants. = The plants benefit from the rain. 这场雨有益于植物。

2). This dictionary will be of great benefit to me. 这本字典将对我有很大的好处。

3). He said he would starve rather than beg for food. 他说他宁愿挨饿也不要饭吃。

4). The enemy is trying to starve us to death. 敌人正在企图饿死我们。

[重点用法]

be of great benefit to = be very beneficial to 对......有益

for the benefit of = for sb' s benefit为了......的利益 benefit from 从......中受益

[练习] 用benefit或其短语的适当形式填空。