Cloning an animal is a complex ________ that can go fatally wrong at any stage.
A．processB．regulationC．stepD．method
A
這題考查詞義辨析：process過程，regulation規(guī)定，step步驟， method方法，根據(jù)句意：克隆動物是個復(fù)雜的過程，每一步都可能出現(xiàn)致命的錯誤。選A。
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