填空题
AccordingtoStevenYoung,ifscientistsgetthedatathat,theywouldpetitionforfasttrackstatus.
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Because the virus changes its shape.
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举一反三
Whileintegrasedeletesanimmunecell'sgeneticmaterialandreplacesitwithitsown,itactslikeinawordprocessor.
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题目答案
a cut and paste operation
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Ifthedrugproveseffectiveinhumantrials,itcouldenhancetheeffectivenessofexistingAIDSdrugsin.
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题目答案
fighting drug-resistant strains of the virus
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Theareagets(年降雨量不足五厘米).
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题目答案
fewer than five centimeters of rain a year
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Theonlysoundsarebirdcallsandthesoftnoise(当水缓缓推动草时草所发出的)
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题目答案
made by grasses as the water slowly moves them
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Thevisitorsplannedto(花最少的时间游览公园以外的地方).
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题目答案
spend minimum time sightseeing outside the parks
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