第12题: [单项选择]That a different component part of the vaccine is necessary is principally due to the variable change of ______. A. virus B. strain C. antigen D. immunization 参考答案:C 答案解析:文章第二段指出“constant changes of antigenic specificity of the virus necessitate a different composition o
第13题: [单项选择]锤造冠代型在恢复形态时哪种操作是不正确的 A. 下前牙舌面可适当加蜡 B. 后牙邻面加蜡 C. 代型加蜡后应在邻面留出0.25~0.30mm的间隙 D. 前牙邻面加蜡恢复外形 E. 胎边缘区适当加蜡 参考答案:E
第32题: [单项选择]What time did Sue leave home A. 5:10 B. 5:00 C. 4:30 D. 5:15 参考答案:C 答案解析:[听力原文] M: I wonder if Sue will be here by 5 o’clock. W: Her husband said she left home at 4:30