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【答案】D【解析】f(1)-f(-1)=1og21-[3-4×(-1)]=-7.

Right then,Henry sensed my embarrassment.He immediately came to my aid.He pulled up my skirt andskillfully tied the drawstring with a beautiful knot.Seeing what Henry did for me,something deep in my mindbegan to change.It seemed as if my cold heart began to melt slowly and my annoyance at him gradually gave wayto guilt.I regretted having treated him as a stranger.While my mind was wandering,our performance time came.It turned out a great success,thunderous applause filling the whole theatre.After the performance,I found Henry and tapped him on the arm gratefully."Thanks,"I said with agrateful smile on my face.I had to admit that but for his timely help,I would have been extremely embarrassed.Without his knotting skill,the performance would have been quite different."Knot a problem.You are mysister,"he grinned innocently,saying humorously.Surrounded by the cheerful atmosphere,I felt a flood ofwarmth of a big family.Maybe it wouldn't be so bad to have a new person in my corner of the world after all.