---How much are the carrots?---One yuan a kilo．---________ cheap．---How much is the chicken?---12 yuan a kilo．---________ expensive．A.That's; That'sB.They're; They'reC.That's; They'reD.They're; That's
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D解析此题考查有关名词单复数的问题，也就是代替单数或不可数名词的代词用this, that或it，而可数名词复数用these, those或they．carrots“胡萝卜”，可数，用They're; chicken，“鸡肉”，不可数，用That's．