世界上60%以上的信件是用英语书写的，上两个世纪英国和美国在文化、经济、军事、政治和科学上的领先地位使得英语成为一种准国际语言。精品学习网为大家推荐了高中二年级英语下册第一单元知识点，请大家仔细阅读，希望你喜欢。

重点词汇

1. achieve

【课文原句】She has achieved everything she wanted to do… (P3)

【名师点拨】achieve v. 意为“完成;达到”，指经过长期努力而达到某目标、地位或标准等。其名词形式为achievement，意为“成就;功绩”，a sense of achievement可指“成就感”。如：

He had finally achieved success.

Even a small success gives you a sense of achievement.

2. condition

【课文原句】She helped improve prison conditions and gave prisoners work and education. (P1)

【名师点拨】condition 意为“环境;境况;条件”时，是可数名词，常用复数形式conditions;意为“状态;状况”时，是不可数名词，be in good condition表示“处于良好的状态”，be out of condition表示“健康状况不佳”。如：

We should pay more attention to the poor living under the bad conditions.

The astronauts soon got used to the condition of weightlessness.

My car is old but in good condition.

He is overweight and out of condition.

【知识拓展】condition意为“条件”时，常用短语on condition that，表示“如果;在……条件下”;在美国英语中，也经常用under the condition that。如：

I will come on condition that Peter is invited.

They agreed under the condition that the matter be dealt with quickly.

3. devote

【课文原句】She devoted all her life to medical work for Chinese women and children. (P1)

【名师点拨】devote vt. 意为“投入于;献身”，其宾语后常与介词to搭配，to后接名词、代词或动名词。devote … to … 意为“献身;致力于”，指把自己、时间、精力等奉献给某种工作或事业。如：

He has devoted his whole life to benefiting mankind.

The girl, to whom he was devoted, died in a traffic accident by chance.

After he has retired, he will devote himself to gardening.

4. behave

【课文原句】Jane has studied these animals for many years and helped people understand how much they behave like humans. (P2)

【名师点拨】behave vi & vt. 意为“举动;举止;行为表现”，如behave well / badly等。其名词形式为behaviour，指“行为;态度;举止”。如：

The parents encouraged the children to behave well in front of the guests.

My camera has been behaving well since it was repaired.

Everyone praises the children's good behaviour.

5. worthwhile

【课文原句】But the evening makes it all worthwhile. (P2)

【名师点拨】worthwhile adj.意为“值得做的;值得出力的”，可作表语或定语。be worthwhile to do / doing sth表示“值得做……”，在动词-ing形式的结构中，worthwhile有时可以用来替代worth，特别是在表示“值得花时间”这一概念时。如：

I think teaching school is always a worthwhile job.

The book referred to by the professor is worthwhile / worth reading.

6. observe

【课文原句】Jane spent many years observing and recording their daily activities. (P2)

【名师点拨】observe vt. 意为“观察;观测;遵守”，可用observe sb do sth，observe + that从句。其名词形式为observation。如：

I observed the man who murdered the boy enter the shop.

He observed that we should probably have rain.

Most information was collected by direct observation of the animals’ behaviour.

7. argue

【课文原句】She has argued for them to be left in the wild and not used for entertainment or advertisements. (P2)

【名师点拨】argue作动词时，意为“争论;争吵;争辩”。argue for意为“为……辩护”;argue with sb about / over sth指“就某事和某人争论”;argue against意为“据理反对;争辩……”。如：

It is no use arguing for the plan because it has been rejected.

We are always arguing with each other about money.

Father argued fiercely against any increase in expenditure for the children’s annual party.

【知识拓展】argue的名词形式为argument，意为“争论;争端;论证”，常构成短语settle an argument指“解决争端”。

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