(单选题)

It was found that the restrooms had more bacteria when ______.

A.only the hand dryer was available to use

B.only paper towels were available to use

C.both the hand dryer and the paper towel dispenser were available to use

D.neither the hand dryer nor the paper towel dispenser was available to use

参考答案：A

参考解析：

细节理解题。根据第四段“The scientists found that when only the hand dryer was available, the amount of bacteria in the restrooms was 27 times higher than on other days.”可知，当只有干手器可用时，洗手间细菌更多，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