题目

My history with music was not good. I still remembered when I took my short-lived piano lessons, my grandfather said _______ to my grandmother, “Why didn’t he make any progress with much practice?” I_______ to make my piano performance attractive. However, my efforts were_______ .So I gave up playing any musical instrument until my old friend Leroy _______ me to play the violin with him when I was 57. It made me enjoy the joy of playing music again. On day, Leroy sent a text_______ me that there was a music performance and he wanted me to join him. Thinking of my past, I _______ his invi 18世纪末，英国乡村医生爱德华·琴纳发明了用接种牛痘的方法预防天花。牛痘接种法的传播及推广实施，拯救了成千上万儿童的生命，开辟了人工自动免疫法预防和根除传染病的正确途径。1980年5月8日第三届世界卫生组织大会宣布，危害人类数千年之久的严重疾病－－天花已从地球消失。下列推理错误的是 [　　] A．接种牛痘使人产生对抗天花病毒的抗体 B．牛痘病毒能使人发病，但症状甚微 C．牛痘病毒、天花病毒的结构相似 D．牛痘病毒、天花病毒有相同的抗原决定簇