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DThe ability to change genes to prevent disease hasadvaneed sinficantly in thelast decade.Ever since the double-helix()structure of DNA was found in the early 150s.scientists have assumed about the possibility of artificially modifying DNA to changethe functions of part of our body.The first approved gene treatment occurred in 1990,when a four-year-old girl had her own white blood cells removed,added with the genesthat produce an ADA,and then put into her body to treat ADA,a genctic condition thatimproves the immune system's ability to fight diseases.The paticnt's body beganproducing the ADA enzyme(),but new white blood cells with the'corrected genewere not produced,so she had to continue receiving the addition.Now,genetic engineering is more available than ever before,thanks in large partto a new tool first used to change eukaryotic cells (complex cells with a nucleus)in2013:CRISPR-Cas9.The gene editing tool works by locating a targeted section of DNAand"cutting?out that section with the Cas9 enzyme.An optional third step involvesreplacing the deleted section of DNA with new genetic material.The technique can beused for a wide range of applications,from increasing the muscle mass of animals kepton a farm,to producing resistant and fruitful crops and to treating diseases likecancer by removing a patient's immune system cells,improving them to better fight adisease and planting again them into the patient's body.In late 2018,Chinese researchers led by He Jiankui announced that they had usedCRISPR-Cas9 to genetically change human embryo(),which were then transferredto a woman's body and resulted in the birth of twin girls-the first gene-edited babies.The twins'genes were improved to make the girls more resistant()to HIV,although the genetic alterations may have also resulted in unintended changes.Thework was widely citicised by the scientific community,showing a need for stricter-regulations for how these powerful new tools are used,particularly when it comes tochanging the DNA of embryos and using those embryos to have live children.,☒32.What is the main idea of the 2d paragraph?A.A patient was successfully treated with technology of gene.B.Research of DNA related with gene was applied to fight diseases.C.The girl stopped the treatment because her old blood cells were removed.D.The immune system's ability to fight disease is worth doubting at present.33.The function of the CRISPR-Cas9 enzyme in genetic engineering is likeB.A forkC.A scissorD.A needleA.A saw4.What is the author's attitude towards the gene-edited baby?A.Objective B.SupportiveC.PessimisticD.Unconcerned35.What's the best title of the passage?A.Bearing live children with edited geneB.Editing gene improved greatly during recent yearsC.Producing new blood cells with the corrected geneD.Making resisted crops with the genetic engineering高一英语试卷第6页（共10页）