(单选题)

How many visitors stayed overnight or gambled in Las Vegas last year?

A.47 million.

B.37. 5 million.

C.30 million.

D.25 million.

参考答案：C

参考解析：

细节理解题。根据拉斯维加斯部分中的最后一句“Last year, total visitors to Las Vegas numbered 37. 5 million; a poll by the Las Vegas Convention and Visitors Authority found that an average of 80% of visitors had either stayed overnight or gambled (赌博) on the Strip.”可知，去年在拉斯维加斯彻夜赌博的人有37.5x0.8=30，也就是3000万人。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