48. C 细节理解题，根据第五段第二句“I fell embarrassed that T complain about not having enough child-free time to work”可判断选C项

　　49. A 推理判断题。根据最后一段内容，可知我意识到母亲的成功，她是天才数学家，母亲充分利用了厨房里的记事本写下数学，以及她对我的影响，由此判断选A

　　50. B细节理解题。根据第五段第二句母亲的话““One day I was cooking and watching baby …It turned out to be a real breakthrough for solving the mathematical problem I was working on.”可知，作者的母亲很热衷于自己的发现，由此判断选B

　　阅读理解-----（B）

　　Christopher Thomas, 27, was a writer by night and a teacher by day when he noticed he was always tired and was losing weight fast. Diagnosed with diabetes(糖尿病), Thomas would need to inject himself with insulin(胰岛素) three times a day for the rest of his life or risk nerve damage, blindness, and even death. And if that weren't bad enough, he had no health insurance.

　　After a month of feeling upset, Thomas decided he'd better find a way to fight back. He left Canton, Michigan for New York, got a job waiting tables, nicknamed himself the Diabetic Rock star, and created diabeticrockstar.com, a free online community for diabetics and their loved ones—a place where over 1,100 people share personal stories, information, and resources.

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