题目

病毒侵入人体后，血液中会出现相应的抗体。抗体的基本组成单位及合成抗体的细胞器分别是 A．氨基酸和核糖体                      B．氨基酸和高尔基体 C．核苷酸和核糖体                      D．核苷酸和高尔基体 答案：Ainvent, hard-wearing,Korea, airplane, bulb1. —How do you usually go to America for your vacation?——I usually take an      there.2. My mother bought me a pair of jeans.They're nice and      3. People should use efficient       at home. It can save much electricity.4. —Do you know when the radio was____  ？  —Around 1895.5. The Yalu River lies between China and