(3,4)
重点词汇
1. n.[c] 系统；体系；制度；方法systematic adj 有系统的; 有条理的
[典例]
The solar system includes the sun and its eight planets.
[练习] 根据意思完成句子。
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. vt. (laid, laid, laying) 把放下；摆设；铺(地毯) ；产(蛋)
[典例]
1). He laid his hand on my shoulder.
2). Who should we lay the blame on?
[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；强调[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.adj. 有害的；伤害的harm n.&vt. 伤害（某人）其反义词为harmless [典例]
There is no harm in doing sth./It does no harm to do sth.做某事是个好主意(或没有坏处)
①It is harmful to your health to drink too much.
②He may say no，but there’s no harm in asking.
[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。
_______________________________________________________________________________ Doctors always tell us that drinking too much________our health，but some people don’t care. A．is harm to B．does harmful to C．is harmful to D．do harm to
4. vi. 存在；生存existence n. 存在
[典例]
1). Does life exist on Mars?
2). I can hardly exist on the wage I’ m getting.
[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.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]
Their reason for doing it is still a puzzle to me.
①Her puzzled look on her face suggested she didn’t understand what I said.
②I have been puzzling about this question for weeks.
[重点用法]
sth. puzzles sb. 某事使某人迷惑/为难sb. be puzzled by sth. 某人对……感到迷惑
puzzle about/over sth. 对某事感到迷惑或苦苦思索（以便理解）puzzl e one’ s brain苦思苦想；绞尽脑汁
solve a puzzle 解决一个难题
[练习] 用puzzle的适当形式填空或翻译。
1). To explain the ________ (puzzle) findings, he offers two theories.
2). _______ _______ _______ (使我困惑的事情) is why he left the country without telling
anyone.
3). She listened with a _______ (puzzle) expression on her face.
4). No one has yet succeeded in explaining the _______ (puzzle) of how life began.
完成句子
She has lost heart since she failed in the exam.She_______________(对将来感到迷茫)．
6.v.拉，拖，拔；移动n.拉，拖；拉(引)力
[典例]
1). You push a nd I’ ll pull.
2). I felt a pull at my sleeve and turned round.
①He pulled the door open and rushed out.
②The police car signalled to us to pull in.
③We waved as the train pulled out of the station.
④The doctor told me that I would pull through.
[重点用法]
pull off (sth)（指机动车辆）驶离（道路）（至路侧停车处停下）
