必修三 Unit 4 Astronomy.doc

必修三 Unit 4 Astronomy: the science of the stars Ⅲ.重点词汇（旨在提供词汇综合运用材料） 1. system n.[c] 系统；体系；制度；方法 systematic adj 有系统的; 有条理的 [典例] 1). The solar system includes the sun and its eight planets. 太阳系包括太阳和它的八颗行星。 2). Alcohol is bad for your system. 喝酒对身体有害。 [练习] 根据句子的意思完成句子。 1). The ______ ______ (教育系统) operates very differently in the US and China. 2). He introduced us a well-designed ______ ______ (铁路系统). 2. lay vt. (laid, laid, laying) 把放下；摆设；铺(地毯) ；产(蛋) [典例] 1). He laid his hand on my shoulder. 他把手放在我的肩上。 2). Who should we lay the blame on? 我们该责备谁? [重点用法] lay短语： lay eggs 下蛋 lay sth. aside 把某物放在一边；积蓄（钱） lay sth. down 把某物放下 lay the blame on sb.责备某人 lay the table 摆桌子 lay emphasis / stress on sth. 把重点放在某事上 [练习] 根据句子的意思在括号里填入适当的词或翻译。 1). The bird ______ its eggs in other birds’ nests. 2). He is a political leader that _____ _____ _____ _____ (非常强调) individual responsibility. 3). He ______ some money ______ for rainy days. 3. harmful adj. 有害的；伤害的 harm n.vt. 伤害（某人） [典例] Many people are aware of the harmful effects of smoking. 很多人都意识到吸烟的危害。 [重点用法] be harmful to sb./sth. 对……有害 do harm to sb.= do sb. harm = harm sb. 对……有害；伤害…… [练习] 根据句子的意思在括号里填入适当的词或翻译。 1). Everyone knows that smoking is ______ to your health. 2). In many cases, too much care for children from parents might even do ______ to their growth. 3). 在阳光下看书对你的眼睛伤害很大。 _______________________________________________________________________________ 4. exist vi. 存在；生存 existence n. 存在 [典例] 1). Does life exist on Mars? 火星上有生命吗? 2). I can hardly exist on the wage I’ m getting. 我靠我挣的工资简直难以餬口。 [重点用法] exist + prep. 存在于地方 exist on sth. 靠某物生存 [练习] 用exist的短语或其适当形式填空。 1). This plant ______ only ______ Australia. 2). Can you ______ ______ such a low salary? 3). I doubt the ______ (exist) of alien. 5. puzzle vt.vi. (使)迷惑；(使)苦思 n.谜；难题 puzzled adj.无法了解的；困惑的 puzzling adj.令人费解的 [典例] 1). Her reply puzzled me. 她的回答把我弄糊涂了。 2). Their reason for doing it is still a puzzle to me. 他们为什麽要做此事我仍莫名其妙。 [重