Generally speaking, children living in a city can not _____ ox ____ cow.
A．tell an; from aB．tell; from
C．tell a; from aD．tell; from a
A
考查動(dòng)詞及冠詞。Ox和cow都是泛指，故分別用冠詞an和a。tell … from …區(qū)分。句意：一般說(shuō)來(lái)，生活在城市的孩子不能區(qū)分公牛和母牛。
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