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24.Which aspect of the author's mother surprised him a few years ago?A.Her examples.B.Her judgement.C.Her background.D.Her acts.:,4,25.What can we know about the author's mother?A.She often argued with her son..B.She worried her sister on purpose.C.She traveled in Turkey with her family.D.Her tattoo shocked her family.26.Which of the following best describes the author's mother?5打：：A.Bold.B.Changeable.d 1H"C.Irresponsible.D.Efficient27.What can we learn from the author's mother?,于nm行A.Never too old to learn.B.Elders are treasures.ulC.Live in the present.D.Actions speak lourder than words.,14,411CtIn the textbooks,science is simple.You come up with an idea,put it to the test,and thenaccept it or reject it depending on what your experiments reveal.In the real world,though,things arenot so straightforward,as a paper just published in Science Translational Medicine shows.In it,agroup of researchers led by Patrick Yu-Wai-Man from Cambridge University investigated a promisingnew genetic therapy(基因疗法)for LHON,,a form of blindness..But things didn't tur out as theyhad expected.\2!装同A faulty gene in a sufferer's mitochondria-the tiny structures that provide a cell's energy-causes retinal(视网膜的)cells to die,which leads to a sudden loss of sight..It affects between onein 30,000 and one in 50,000 people.Treatment is limited and not particularly effective.Since most cases are caused by a change in a single gene,LHON can be theoretically cured byreplacing the faulty gene with a working one.Dr Yu-Wai-Man's team put a corrected copy of thegene onto a defanged(无害化的)virus and then injected(注射)the virus into their patients'eyes.It couldn't reproduce but was able to replace the damaged gene with a working copy.Most medical studies make use of a control group,so that researchers can measure theeffectiveness of the treatment.Here,the researchers controlled the experiment by injecting only oneof each patient's eyes with the virus,leaving the other untouched.The surprise came several months into the study.The researchers had hoped to see a bigimprovement in the treated eyes,compared with the untreated ones.They did not,and for that reasonthe study failed.Instead,in more than three-quarters of their patients,they saw substantialimprovements in both eyes.Follow-up studies found that the virus had found a way to travel from oneeyeball to the other.高二英语试题第5页（共10页）