Unit 4 Astronomy：The science of the stars
用cheer相關(guān)短語(yǔ)的適當(dāng)形式填空（原創(chuàng)）
①your visit has greatly him up.
②the crowd the runners as they started the last lap.
③you look as though you need up.
答案：①cheered②cheered; on③cheering
7. puzzle
vt.&vi.（使）迷惑；（使）苦思
n.迷；難題
puzzled adj. 無(wú)法了解的；困惑的
puzzling adj. 令人費(fèi)解的
her reply puzzled me.
她的回答把我弄糊涂了。
their reason for doing it is still a puzzle to me.
他們?yōu)槭裁匆菢幼龃耸挛胰愿械侥涿睢?br>常用結(jié)構(gòu)：
sb. be puzzled by sth.某人對(duì)……感到迷惑
puzzle about/over sth.對(duì)某事感到迷惑
puzzle one’s brain冥思苦想；絞盡腦汁
solve a puzzle解決一個(gè)難題
高手過(guò)招
用puzzle的適當(dāng)形式填空
①to explain the findings, he offers two theories.
②i that i haven’t heard from liz for so long.
③she listened with a expression on her face.
④no one has yet succeeded in explaining the of how life began.
答案：①puzzling②am puzzled③puzzled④puzzle
8. exist
vi. 存在，生存
existence n. 存在
does life exist on mars?
火星上有生命嗎？
i can hardly exist on the wage i’m getting.
我靠自己掙的工資簡(jiǎn)直難以糊口。
常用結(jié)構(gòu)：
exist+prep. 存在于某地方
exist on sth. 靠某物生存
高手過(guò)招
用exist相關(guān)短語(yǔ)的適當(dāng)形式填空
①this plant only australia.
②can you such a low salary?
③i doubt the of alien.
答案：①exists; in②exist on③existence
重點(diǎn)短語(yǔ)
9. in time意為“及時(shí)”時(shí)相當(dāng)于early enough, soon enough;意為“終于，早晚”時(shí)相當(dāng)于sooner or later。
we got to the station just in time to catch the bus.
=we got to the station just in time for the bus.
我們到達(dá)車站時(shí)，剛好趕上了那班汽車。
the doctor came in time to save her life.
醫(yī)生及時(shí)趕來(lái)救了她的命。
youll succeed in time if you keep on working hard.
假若堅(jiān)持努力下去，你遲早會(huì)成功的。
聯(lián)想拓展
be in time for sth./be in time to do sth.
對(duì)于某事是及時(shí)的/及時(shí)做某事
ahead of time提前；提早
all the time一直；始終
at one time曾經(jīng)；一度