2016届高考英语一轮复习课时作业：语言朋友（26）(北师大版)

　　语言朋友(26)(香水) come in tiny bottles,

　　perfect a particular smell, perfume­makers often use an ingredient that comes from sperm whales, called ambergris.But using ambergris, which helps a perfume last longer, is strongly opposed by many people who think it is wrong to kill whales just so we can smell sweet.Joerg Bohlmann is neither a perfumer nor a whale expert.He's a plant biologist at the University of British Columbia in Canada.But his discovery of a new plant gene (基因) might push whales out of the perfume business.

　　The gene comes from fir trees, found throughout North America and commonly used as Christmas trees.The trees produce a chemical that can be used in perfume in place of ambergris－but with_a_catch．mical is mixed with many others.That makes separation a challenge，” Bohlmann says.“It's like trying to isolate sugar from a biscuit.”

　　This is where science becomes useful.When Bohlmann learned that fir trees produce the ambergris璴ike chemical, he decidted to use his gene know­how to find the instructions for how to make the ambergris­substitute.

　　Bohlmann found that gene and took it out of the tree cells.Then he did something that might sound strange to someone who doesn't work in genetics: Bohlmann put the gene from the tree into yeast (酵母) cells.t the fir tree gene into the yeast, the yeast started making the same chemical that had been produced by the tree.

　　Perfumers pay big money for ambergris because it is a fixative, which means it holds a smell in place on a person's body.

　　揅heap perlfumes smell good in the first hour or so and then everything is gone，” explains Bohlmann.“But expensive perfumes are much more stable.Their smell lasts much longer, for hours or even a day after you apply them.”

　　The new chemical, made from the tree genes, can be used as a fixative, too.And using yeast to make it is far cheaper than acquiring ambergris.

　　Bohlmann admits he never thought he'd get into the perfume business.But now, he says, producers have been calling to find out how to use his technology in new perfumes.

　　解题导语：制作香水需要从鲸鱼里提取龙涎香生物学家约尔格·博尔曼最近发现枞树里有一种物质可以代替龙涎香。________．ery expensive

　　解析：推理判断题。根据第二段“perfume­makers often use an ingredient that comes from sperm whales, 可知来自抹香鲸的龙涎香应该很贵故选D。________．A．being difficult to hold

　　B．having a hidden problem

　　C．needing further testing

　　D．being too similar

　　解析：词义猜测题。根据下文“There's a problem that many people wouldn't consider.”可知有一个不为人知的问题即隐藏的问题故选B。lls often used in genetic research?

　　A．They can take on the characteristics of other genes.

　　B．They can reproduce much faster than other cells.

　　C．They share some of the qualities of plant genes.

　　D．They're much cheaper to use than ambergris.

　　解析：细节理解题。根据第七段“Biologists like to work with yeast because it easily adopts new genes and changes its features and behaviour.”可知因为它们能呈现出其他基因的特征故选A。What can we learn about Joerg Bohlmann from the passage?

　　A．He is opposed to whale hunting.

　　B．He made his discovery during Christmas.

　　C．He has worked in the perfume industry for many years.

　　D．He has previously done genetic research.

　　解析：细节理解题。根据文章内容可知Bohlmann以前做过基因研究工作故选D。What is the best title for the passage?

　　A．The Christmas tree's secret.

　　B．The sweet smell of success.

　　C．Whale­free perfume.

　　D．Save the whale.

　　解析：主旨归纳题。根据全文的内容可知这个研究成果的运用可不再需要从鲸里提取龙涎香制作香水C。to be young again.She quickly replied，“Wish to be young again? No，for I have learned too much to lose if I am a far6.________(value)person today than I was 30 years ago，or 20 years ago，or 15，10 or even 5.I have learnt so much 7.________I was 70.”

　　Buck understood that life isn't meant to be lived on bell curve(钟形曲线)．We don't go up for a while and then________，we are able to continue on an upward trend.And one of the most significant ways we can do that is by learning from the lives of9.________－especially children.________(share)what we've learned with the children in our lives, we offer them something11.________they can get nowhere else－the treasure of experience.When I think back to the many positive influences on________childhood，I recognize that some of the greatest gifts I13.________(receive)are the lessons I collected from the older people in my life.I still remember clearly14.________Grandpa Maxwell always encouraged and taught us kids when he came to visit.He never left our house15.________sharing his life experiences.Those times shaped our lives so much!

　　解题导语：当你年老时如果给你一次机会你会选择重回青春年代吗？解析：根据后文的than 可知用形容词的比较级。答案：more valuable解析：引导时间状语从句表“自从……以来”用since。答案：since8．解析：空格前后语意相对表“相反”用instead。答案：Instead解析：泛指除自己以外所有的人。答案：others解析：不定式表目的。答案：to share解析：引导定语从句修饰不定代词something。答案：that解析：句子主语为I此处确指“我”的childhood。答案：my解析：空格处作谓语表完成。答案：have received解析：引答案：how解析：表“没有不”用without。答案：without