Chinese scientists have produced an embryo of a giant panda through cloning technology,_____ is a breakthrough ______ could save the endangered animals.
A．that; whichB．which; thatC．which; whatD．that; what
B

試題分析： 句意：科學(xué)家已經(jīng)通過克隆技術(shù)復(fù)制出大熊貓的胚胎，這是能夠拯救瀕危動(dòng)物的一項(xiàng)突破。第一空填which，引導(dǎo)非限制性定語從句，指代前面的內(nèi)容，that不能引導(dǎo)非限制性定語從句，第二空填that修飾breakthrough，在定語從句中做主語，所以選B。
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