问题
填空题
免疫的功能：第一个方面及时清除体内_________细胞；第二个方面抵抗__________的侵入，防止疾病的产生，维持人体的健康；第三个方面随时监视识别和清除体内产生的___________细胞。
答案
衰老、死亡和损伤 抗原 异常
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免疫的功能：第一个方面及时清除体内_________细胞；第二个方面抵抗__________的侵入，防止疾病的产生，维持人体的健康；第三个方面随时监视识别和清除体内产生的___________细胞。
衰老、死亡和损伤 抗原 异常
| 从方框里选择正确的短语，并用其正确的形式填空。 | |
2. He____ losing his own life and saved my life in the cold river. 3. Finally,she____a pink dress. 4. Having moved to the northeast of China, I must ____ the dry weather. 5. The advertising campaign didn't____ on sales. 6. I____a cup of hot tea in the cold winter every evening. 7. 50 million Americans are thought to ____nicotine. 8. ____circumstances beyond our control the lecture was cancelled. 9. He____ smoking following his father's example. 10.They kept going____ their fears. |