【金版学案】2014高考英语总复习(语法填空+阅读理解+写作训练)基础知识 每日一练8 北师大版

1、 8has reached 作谓语，填动词的三单形式，“reaches。9running with宾宾补，填 running。10its 根据句意“中国计划扩大它的高速公路网，填its。To perfect a particular smell，perfumemakers often use an ingredient that comesfrom sperm whales，called ambergris.But using ambergris，which helps a perfume lastlonger，is strongly opposed by many people who th

2、ink it is wrong to kill whales justso we can smell sweet.Joerg Bohlmann is neithear perfumer nor a whaleexpert.Hesa plant biologist at the University of British Columbia in CanadABut his discoveryof a new plant gene (基因) might push whales out of the perfume business.The gene comes from fir trees，fou

3、nd throughout North America and commonly usedas Christmas trees.The trees produce a chemical that can be used in perfume in placeof ambergris but with_a_catch.1 / 3 wordBohlmann found that gene and took it out of the tree cells.Then he did somethingthat might sound strange to someone who doesntwork

4、in genetics: Bohlmann put thegene from the tree into yeast (酵母) cells.Yeast may sound familiar because its used to make things like bread，wine andbeer.Biologists like to work with yeast because it easily adopts new genes andchanges its features and behaviour.When Bohlmann put the fir tree gene into

5、theyeast，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 itholds a smell in place on a persons body.“Cheap perfumes smell good in the first hour or so and then everything is gone，explains Bohlman

6、n.“But expensive perfumes are much more stable.Their smell lasstmuch 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.Andusing yeast to make it is far cheaper than acquiring ambergris.Bohlmann admits he never thought hed get

7、into the perfume business.But no，whe says，producers have been calling to find out how to use his technology in newperfumes.1It can be inferred from the passage that if a perfume contains ambergri，s_.Aits user probably supports whale huntingBits smell will last for about an hourCthere will be a whale

8、 symbol on the bottleDit is probably very expensive2The underlined expression “with a catch in paragraph 3 means_.Abeing difficult to holdBhaving a hidden problemCneeding further testingDbeing too similar3According to the passage，why are yeast cells often used in genetic research?AThey can take on t

9、he characteristics of other genes.BThey can reproduce much faster than other cells.CThey share some of the qualities of plant genes.DTheyre much cheaper to use than ambergris.4What can we learn about Joerg Bohlmann from the passage?AHe is opposed to whale hunting.BHe made his discovery during Christ

10、mas.CHe has worked in the perfume industry for many years.DHe has previously done genetic research.5What is the best title for the passage?AThe Christmas trees secretBThe sweet smell of successCWhalefree perfumeDSave the whale答案：1D 推理判断题。根据 perfumemakers often use an ingredient that comes fromsperm whales, called ambergris.因为它来自抹香鲸，所以它是贵的，选 D。2B 词义猜测题。根据“Theres a problem that many people wouldnt consider.有一个不为人知的问题即隐藏的问题，选 B。3A 细节理解题。根据 Biologists like to w