CH₃COOH是一种弱酸，而氯乙酸（CH₂ClCOOH）的酸性强于CH₃COOH，这是因为﹣Cl是一种强吸引电子基团，能使﹣OH上的H 原子具有更大的活动性．有的基团属于斥电子基团，能减弱﹣OH上H 原子的活动性，这种作用叫“诱导效应”．

根据以上规律判断：

    This is Mary's family. After dinner, Mary's mother talks on the phone. Mary's father watches TV. Mary's grandfather reads books. Mary's brother draws a picture. Mary plays with her teddy bear. They are a happy family.

⑴Mary's mother ____          A.

⑵Mary's father ____           B.

⑶Mary's grandfather ____      C.

⑷Mary's brother ____         D.

⑸Mary ____                 E.