This story—which happened before I was born—reminds me how extraordinary my mother was, and is also a gifted mathematician. I feel embarrassed that I complain about not having enough child-free time to work. Later, when my mother is in the bathroom, I go into her kitchen and turn over the breadboards. Sure enough, on the back of the smallest one, are some penciled marks I recognize as mathematics. Those symbols have traveled unaffected through fifty years, rooted in the soil of a cheap wooden breadboard, invisible（看不到的）exhibits at every meal.

　　46．Why has the author’s mother always kept the notepad and pencil in the kitchen?

　　A．To leave messages.

　　B．To list her everyday tasks.

　　C．To note down maths problems. D．To write down a flash of inspiration.

　　47. What is the author’s original opinion about the wooden stand?

　　A. It has great value for the family.

　　B. It needs to be replaced by a better one.

　　C. It brings her back to her lonely childhood.

　　D . It should be passed on to the next generation.

　　48. The author feels embarrassed for

　　A. blaming her mother wrongly.

　　B. giving her mother a lot of trouble.

　　C. not making good use of time as her mother did.

　　D. not making any breakthrough in her field.

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