A team of American scientists has found a treatment to protect humans from the deadly H5N1 flu virus, ________ brings great ________ to the world.A.that; appearanceB.which; reliefC.which; advantageD.that; profit
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B解析第一空考查非限制性定语从句，which 做主语，指前半句话的含义，第二空根据句意是把很大的安慰带给世界。relief解脱，放松，appearance出现，advantage有利条件，profit 利润，所以选B。