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Step3.Researching cooperatively& answering questions(合作探究, 解决问题)
Task1. Get the Ss to learn the following language points:
1.Can you think of the alternatives we would use today?(P37)
你能想出我们现在的替代物品吗？
【词语探究】阅读下列句子,注意alternative的词性及意思。
(1)Alternative is something that you can choose to do or use instead of something else.(n.替代品)
(2)Caught in the act, he had no alternative but to confess.
(have no alternative but to do sth.别无选择,只能做某事)
他被当场抓住,除了招供别无出路。
【词语运用】根据所给的汉语提示完成句子。
(1)你有没有其它的建议?_____________________________________________
(2)他别无选择，只好一个人去那儿。____________________________________
答案：(1)Have you got an alternative suggestion？
(2)He had no alternative but to go there alone.
2.I，m sorry to interrupt you but how could they live here？(P38)
对不起，打断你的讲话。请问他们怎么能够住在这个地方呢？
【词语探究】阅读下列句子,注意interrupt的搭配及意思。
(1)Trade between the two countries was interrupted by the war.(be interrupted by被……中断)
(2)Don，t interrupt(me)while I，m busy!(interrupt sb.中断某人的谈话;打扰某人)
【词语运用】根据汉语提示完成句子。
(1)别打扰他，他还没完成呢。_______________________________________
(2)他的学习由于战争而中断。________________________________________
答案：.(1)Don，t interrupt him, for he hasn’t finished yet. (2)His studies were interrupted by the war.
3.So we think it is reasonable to assume they lived in these caves, regardless of the cold.(P38)因此，我们有理由认为他们不顾严寒，就住在这些洞穴里。
【词语探究】regardless of不管,不顾
词语辨析 even if/though; regardless of
（1）even if/though 表示“尽管”,从属连词,后面要接句子。（2）regardless of 介词短语，后面接名词、代词或动名词。
【词语运用】用even if/though, regardless of 填空。
(1)The training class welcomes all students _________ age.
(2)I like her _____________she can be annoying.
(3)_____________I have to walk all the way, I’ll get there.
答案：.(1)regardless of (2)even if/though (3)Even if/though
4.That(The fire)would have kept them warm, cooked the food and scared wild animals away as well.(P38)他们用火来取暖、做饭，还可以用火来吓跑野兽。
would:表示猜测,意思“想必…… ”、 “肯定会…… ”,用于虚拟语气。
如：(1)如果汽车当时翻到悬崖下,他们早就丧命了。
They would have been killed if the car had gone over the cliff at that moment.
(2)你要是能走开，我感激不尽！I would be glad if you would go away!
【词语辨析】 would与used to 都表示过去习惯性的动作。
（1）would:不涉及与现在情况的对比,常带有浓厚的感情色彩。
（2）used to:表示过去习惯性的动作或状态，但这种习惯现在已不存在了。
【词语运用】用would, used to填空。
(1)When he was there, he ____（go）to that coffee shop at the corner after work every day.
(2)He____（go） to that river to swim after school.
答案： (1)would go (2)used to go
5.It seems that they used the sharpened stone tools to cut up animals and remove their skin.(P38)看样子他们可能是用磨尖的石器来切割野兽并剥皮。
【词语探究】阅读下面的句子,注意cut up的用法。
(1)She cut up the meat for her little dog.(切碎)
(2)He seemed very cut up by his troubles.(使丧气)
(3)We have cut up the enemy ，s forces.(歼灭)
【词语归纳】
cut in插嘴，打断
cut off切断，阻断，使分离，使隔离
cut through穿过
cut down砍伐,缩短
cut out删掉，剪裁
【词语运用】选用上述短语填空。
(1)More and more trees have been__________ and this has caused serious pollution in this area.
(2)It is considered impolite to _____________when others are speaking.
(3)The mountains _____________them _____________ from the rest of the world.
(4)Let，s _____________the fish for some soup.
(5)He managed to _____________the crowd to catch up with his friends.
答案：(1)cut down (2)cut in(3)cut...off (4)cut up (5)cut through
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