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Mrs. Black lives in a small village. Her husband is dead. Her son, Jack, lived with her. He worked in a shop in the village, but then he found a job in town named Green Sea. He went to live there. Mrs. Black was very angry. She got on a train and went to see her son. Then she said to him, "Jack, why do you never telephone me?"
Jack laughed, "But, mother, you haven’t got a telephone. "No." She answered, "I haven’t, but you have got one. "

阅读材料，请回答：

材料：天下既定，民亡盖臧，自天子不能具（选不出）纯驷（四匹毛色一样的马），而将相或（有的人）乘牛车。上（皇帝）于是约法省禁（制定许多节约的措施），轻（减轻）田租，十五而税一（收入的十五分之一来交税），量吏禄，度官用（裁减官府的开支用度），以赋于民（并据此来制定农民的赋税标准）。

﹣﹣《汉书》

AaBb 1AB∶1Ab∶1aB∶1ab 配子间16种结合方式 子代中有9种基因型 4种表现型(9∶3∶3∶1)

设f（x）=log ${}_{\frac{\mathrm{₁}}{\mathrm{₂}}}$ $\frac{1-ax}{x-1}$ 为奇函数，a为常数，