问题补充：
---How old is your mother?
---She is years old. Today is her birthday.
A. fourteen；fortieth
B. fourty; forty
C. forty;fortieth
D. fortieth;forty
答案：
A. fourteen；fortieth
B. fourty; forty
(答案→)C. forty;fortieth
D. fortieth;forty
解析：句意：---你的妈妈多少岁？--她四十岁了，今天是她的四十岁的生日。第一空应该用基数词，故排除BD；第二空应该用序数词。故选C。
考点: 考查数词的用法。
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