皮皮学，免费搜题
登录
搜题
【简答题】
科学家通过研究发现，传染病能够在人群中流行，必须同时具备传染源、传播途径和易感人群这三个基本环节．缺少其中任何一个环节，传染病就流行不起来．传染病的预防措施可分为控制传染源、切断传播途径、保护易感人群三个方面．下列表示的传染病预防措施图中，主要针对的是哪一方面． A、______；B、______．
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】Read and judge. （判断短文下的句子是否与短文内容相符，用“√”“×”表示） Tom has a big dog. Its name is Jack. Jack's hair is long and yellow. He is very smart. Every Sunday afternoon Tom takes Jack for a long walk in the park. ...
【单选题】When Tom was very young ,he was ______ skateboarding, ______worried his parents a lot.A．in; thatB
A.
24．When Tom was very young ,he was ______ skateboarding, ______worried his parents a lot. A．in; that
B.
into; which
C.
fond of; that
D.
like; which
【简答题】书面表达。 Tom 最近遇到了难题，他给某医学杂志的专栏作者Jenny 写了一封信，以寻求帮助。 Dear Jenny, I'm was a very good student before, but these days I can't follow my teachers at school. I'm very worried about my lessons. I'm always unde...
【简答题】阅读下面短文，根据短文内容，完成81-85小题。 Tom lost his work last year and he didn’t find a job from then on. He was very worried. He had a big family to feed. His sons and daughters were often hungry. His wife was ang...
【简答题】影响行政效率的因素有 、体制因素、人员因素、决策因素、法制因素。
【简答题】完形填空。 It was seven thirty. Supper was 1 an hour ago, but Tom still wasn't 2 . Mrs Brown was worried. She went to the door and 3 . Half an hour later, Tom got home. When he saw his mother, he said, 'I'...
相关题目：
参考解析：
知识点：
题目纠错 0
发布
