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1、UNIT 5. 单词拼写1His a (抱负) is to become a great scientist in the future.2She welcomed us with a c (兴高采烈的)greeting.3In the past, studying abroad was a d (遥远的) dream for most people.4He is practicing every day, in p (准备) for the iceskating championship.5He travelled alone across the whole c (大洲) of Afric
2、a from east to west.6The first thing youll see on Mars will be one of the p (极地的) ice caps. 完成句子1. 回家途中，我拜访了王先生。 ，I visited Mr.Wang.2. 他们都在为明天的考试做准备。They are all .3. 我们刚才请人把洗衣机修好了。We just now.4. 一个月内，他花光了身上所有的钱。Within a month, he all his money5. 门慢慢打开，那位女士就站在那里。The door opened slowly and there . 阅读理
3、解In one of the worlds most forbidding environments，polar bears spend their summers roaming (漫步) the Arctic on large pieces of floating ice. They drift(漂移) for hundreds of miles，finding mates，hunting for seals，and fatting themselves up for the winter. Without the floating ice，the worlds largest bears
4、 could not survive. Yet at this moment，the polar bears Arctic habitat (栖息地) is melting away under it because of global warming.Over the past three decades，more than a million square miles of floating ice has disappeared. Scientists predict that，if the current rate of global warming continues，most，if
5、 not all，of the bears floating ice will be gone by 2100.As a result，the worlds polar bears could face global dying out by the end of this century.Already，the ice on the southern edge of the polar bears habitat is melting about three weeks earlier than in the past. The loss of those key weeks leaves
6、the bears less time to hunt，eat and store up fat. Once the ice melts，the bears must fast for up to eight months on land until the floating ice returns. As a result of early melting，there has been a 14 percent decline in the Hudson Bay polar bear population over the past ten yearsa fall clearly cause
7、d by global warming.Besides，a growing number of polar bears may be drowning (溺水) as they are forced to swim more often，and for longer distances，looking for ice sheets(冰原)According to a report by the US Minerals Management Service，researchers observed four dead polar bears floating 60 miles off Alask
8、a in September of 2006 and said it was likely that many other bears swimming far off shore also drowned. Scientists have concluded that the worldwide population of about 20，000 polar bears is likely to become smaller by more than 30 percent in the next 35 to 50 years alone.1What do polar bears usual
9、ly do in summer?ALook for relatives.BHunt for food.CStore crops up.DMake friends with seals.2What disaster will happen to polar bears by the end of this century according to the text?AGlobal drowning.BGlobal dying out.CGlobal hunger.DGlobal roaming.3What can be inferred from the underlined part in p
10、aragraph 3?AThe bears will have to stay hungry longer.BThe bears will have to roam faster.CThe bears will have to stay quieter on land.DThe bears will have to face a faster fall of its population.4Why do polar bears have to swim more often and farther?ATo search for food.BTo build up bodies to survi
11、ve.CTo find places to land on.DTo escape being hunted. 七选五Were told to buy environmentally friendly cars and change the old electrical items in our home. But what if youre a teenager and not in control of such things？Worseyour parents have more important things to worry about than global warming (全球
12、变暖)_1_ But youre completely wrong；there are many things you can do.Take a shower instead of a bath. When taking a shower，dont use too much time. Try to keep it below 10 minutes._2_ Make it a kind of game，trying to beat your old “score” every time you take a shower._3_ For example，buy recyclable pens
13、 that could be filled with ink(油墨) rather than pens that get thrown away after being used. If you have papers，bottles or whatever，dont throw them away. Instead，send them to the recycling company in your area.Talk about pollution and global warming with your parents._4_ They wouldnt mind a few sugges
14、tions every now and again. So be patient and influence them gradually. Then you might find they will be interested in living a green life.Havent got any ideas for your birthday presents？_5_ Recycled notebooks or solarpowered chargers.There are lots of useful and green things you can buy. And there w
15、ill be an added warm feeling on your birthday.AConsider a green idea.BYou dont use so much energy.CTry buying things that could be recycled.DDont turn the heat all the way up，either.EYou might think as a teen，you cant do much to help.FMany adults dont care about environmental protection.GDont push them to be greener because that may make them angry.语法填空“Remember, your f
