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
B
第一空考查非限制性定語從句，which 做主語，指前半句話的含義，第二空根據(jù)句意是把很大的安慰帶給世界。relief解脫，放松，appearance出現(xiàn)，advantage有利條件，profit 利潤，所以選B。
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