第15题: [单项选择]What is the function of the new device mentioned in the health report A. It is used to destroy cancer cells. B. It makes identification of AIDS easier. C. It kills the human immunodeficiency virus. D. It helps strengthen the body’s natural defense. 参考答案:B 答案解析:[听力原文]
December 1st marked World AIDS Day. People around the world join together to celebrate pr
第16题: [单项选择]下列各组原料中不完全属于粘合体系的有() A. 癸酸钴、白炭黑 B. RA65、OT20 C. 癸酸钴、间苯二酚 D. 白炭黑、硬脂酸 参考答案:D