(单选题)

At the places where you see sign 1, ______.

A.you are already out of town

B.you still have thirty kilometers to go

C.there must be many houses and building not far away

D.there must be a town thirty kilometers away

参考答案：C

参考解析：

细节理解题。根据第二段第二句和第三句“When drivers see this sign, they must not go at more than thirty kilometers an hour. We see this sign when we are getting near a town.”可知，这里的30指的是限速30，这个标志表明我们现在快要进入城镇了，A项、B项和D项错误，故选C。

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