________ is as much an art as it is ________ science.
A．Cloning; aB．Clone; / C．To clone; the D．Cloning; the
A

第一空考查動名詞做主語，第二空填a表示泛指：一門科學(xué)，句意是：克隆即是藝術(shù)又是科學(xué)。選A。
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