A Lesson in a Lab

解析：選d。keep off 不靠近。句意“不要靠近火，否則衣服容易著火。”
【即境活用】
⑦ go ahead　開始；繼續；進展；領先
(回歸課本p48) go ahead！means begin!
“開始吧！”意思是“開始！”
【歸納總結】
go ahead with繼續做……��
go straight ahead一直往前走��
go ahead of走在……前頭
①“may i ask you a question？”“yes，go ahead.”
“我可以問你一個問題嗎？”“可以，問吧！”
②don’t be disturbed；just go ahead with your work.
不要受干擾，你們只管干你們的活。
③things are going ahead smoothly.
事情進展順利。
④you go ahead and tell them that we will be there shortly.
你先走一步，告訴他們我們隨后就到。
【例句探源】
10.(XX年高考四川卷)—may i open the window to let in some fresh air?
—________
a.come on！　　　　　　 b.take care!
c.go ahead!     d.hold on!
解析：選c。問句是在請求許可，句意是：我可以打開窗戶，讓新鮮空氣進來嗎？四個選項中只有go ahead！表示說話者同意，意為“打開吧！”come on！用來催促對方，意為“快點吧！”take care！小心！hold on！堅持住！。
【即境活用】
★11. (XX年高考安徽卷)—could you be so kind as to close the window?
—________.
a.with pleasure　　　　　 b.go ahead
c.yes，please     d.that’s ok
解析：選a。問句的意思是“你可不可以好心把窗戶關上？”這個情景是請對方做某事，所以回答不能用go ahead，而是with pleasure(愿意)。
★12.(XX年高考重慶卷)—honey，let’s go out for dinner.
—________i don’t have to cook.
a.forget it！　　　　　　 b.that’s great!
c.why?      d.go ahead.
解析：選b。句意：——親愛的，我們去外面吃晚飯吧。——太好了！我不必做飯了！由語境i don’t have to cook可知，聽話者非常贊同說話者提出的建議，故答案為b項。forget it“沒關系”“不必太在意”；why？“干嘛？”go ahead“去做吧”，都不符合語境。
⑧ be supposed to do　被期望或被要求(按規則、慣例等)做(某事)
(回歸課本p49)...as both are supposed to have good physics departments.
……因為兩個(大學)都有不錯的物理系。
suppose v.假設，假定��
it is supposed that...認為……��
be supposed to do/ be sth.被期望做……/應該……��
i don’t suppose(that)我以為……不會……��
i suppose so/not.我想可以/不可以。��
be supposed to have done被認為做過某事；本應當做某事
【歸納總結】
①it was generally supposed that it would not happen again.
一般都認為此事不會再發生。
②everybody is supposed to know the law，but few people do.
人人都應當懂得法律，但很少有人懂。
③whoever was supposed to be fit for the job was asked to sign up.
無論是誰，只要被認為適合做這項工作都被要求報了名。
【例句探源】
④you were supposed to have come，we had been waiting for you.
你應當來，我們一直在等著你。