(单选题)

From the passage, we can learn that ______.

A.a smile or greeting to strangers makes the atmosphere warmer

B.the best way to know a stranger is reading the same newspaper

C.one should always guard against the harm others might do to him

D.people should be alert to strangers and try to avoid contact

参考答案：A

参考解析：

推理判断题。根据倒数第二段第四、五句“We smile and can’t help it. We have said it; the barrier has been broken. ”可知，对陌生人的微笑或问候会使气氛更温暖。故选A。

知识点：阅读理解四选一英语专业基础知识阅读理解教师招聘-小学英语