问题
选择题
搞好个人卫生和环境卫生，消灭媒介生物，清除中间寄生生物和消毒工作是为了（ ）
A．控制传染源
B．保护易感人群
C．切断传播途径
D．消除病原体
答案
搞好个人卫生和环境卫生，消灭媒介生物，清除中间寄生生物和消毒工作，目的是杀死环境中的病菌，防止病菌通过环境中的生物或者空气媒介传播疾病，这些都是属于切断传播途径．
故选：C
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搞好个人卫生和环境卫生，消灭媒介生物，清除中间寄生生物和消毒工作是为了（ ）
A．控制传染源
B．保护易感人群
C．切断传播途径
D．消除病原体
搞好个人卫生和环境卫生，消灭媒介生物，清除中间寄生生物和消毒工作，目的是杀死环境中的病菌，防止病菌通过环境中的生物或者空气媒介传播疾病，这些都是属于切断传播途径．
故选：C
Helen is a student. She usually gets up at 6:00 in the morning. Then she has at 6:30 a.m. She goes to school 7:00 a. m.. She is never late for school(从不迟到). Helen is a clever girl, she doesn’t have any friends. One morning , on her way to school, she finds yellow cat. She thinks,“The cat can’t find way home.” So she it to the zoo. Then she hurries(急忙) to , but she is late. All the students and her look at her. Her face looks red. After class, her teacher says to the students.“Helen is a girl. She finds a cat and takes it to the .”Now all her classmates like her.
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