金太阳2023-2024学年湖南省高二年级期末考试(正方形包菱形)英语答案

2024-07-09 01:35:30 4℃

金太阳2023-2024学年湖南省高二年级期末考试(正方形包菱形)英语答案正在持续更新，本期2024衡中同卷单元卷答案网为大家整理了相关试题及答案，供大家查缺补漏，高效提升成绩。

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c"Big Tree,"an old southern live oak,sits in a park just outside Orlando's businessdistrict.It's been struck by lightning at least three times and has survived many hurricanes-and it grew from a seed around the same time Juan Ponce de Leon's ship first landedon Florida's eastern coast.Over 400 years old,the tree is so impressive that members of a Michigan-basednonprofit flew to Orlando in February to climb the tree and cut branches and leaves.Theresearchers are now in the midst of the process to grow new roots from the cuttings.Thereason:To clone the historic tree,store its DNA and plant potentially thousands of clonedtrees across the Southeast.In order to.clone an ancient tree,researchers must climb it to find a piece of livetissue.The freshly cut branches and leaves are taken to the group's lab in Michigan,where,in climate-controlled rooms,researchers work to promote growth from the cuttings.The most common method is by rooted cuttings.In this method,a tip of a tree'sbranch is dipped(蘸)into hormones,placed into a foam plug(泡沫塞)and set inside a mistroom.Then,the waiting begins.A sign of life can take several months to a year to show,if one comes at all.In another method called tissue culture,researchers take a quarter-inchof branch,dip it into a mixture made up of a dozen hormones and other chemicals,seal(it in a container and wait to see whether it will grow roots.Experts lauded the group for its creative methods and reproduction in large numbers,but they doubt whether the clones will grow as the originals do.Scott Merkle,a professorof forest biology at the University of Georgia,said,"There are so many variables that there'sno certainty that they will be able to survive and perform better than other trees that youplant on the same land".He added that the age of historic trees makes them difficult tostudy."I think it's a great thing that they're doing...I just don't know how realistic it is."28.According to the passage,what do the researchers aim to do?A.To clone an ancient tree from its original.B.To save thousands of trees across the Southeast.C.To analyse the effects of climate on tree growth.D.To study the reason for the survival of "Big Tree".29.What do we know about the two methods mentioned in paragraph 4?A.Tissue culture is the most frequently used method.B.There is a chance that the branch will fail to grow roots.C.In the first method the live tissue is sealed in a container.D.A mixture of hormones and other chemicals is needed in both methods.30.What does the underlined word "lauded"in paragraph 5 mean?A.Joined.B.Charged.C.Praised.D.Contacted.31.What's Scott Merkle's attitude to the group's work?A.CautiousB.Critical.C.Approving.D.Unclear.十校高二英语试题卷一5（共10页）

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