问题
填空题
传染病流行过程的3个环节是指传染源、（）和（）。
答案
参考答案：传播途径；易感人群
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传染病流行过程的3个环节是指传染源、（）和（）。
参考答案：传播途径；易感人群
| 让我们一起走进阅读乐园吧！选择正确答案。 | ||||
| Thomas Edison（托马斯·爱迪生） Thomas Edison invented (发明) many 1 , although (尽管) he didn't have much school education (教育). How did he do all these? Because he knew how to 2 a lot of things that 3 not taught 4 the classroom. He got knowledge (知识) from books outside school. He worked hard all 5 life, and the most important (重要的) thing is that he knew how to use his head. | ||||
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