根据以下内容回答下列各题， Many people believe they should drink eight glasses of water a

day. That is 41 they have been told all their life. 42 a new report says people should drink as 43 water as they feel like drinking. The report does not 44 people how many gasses of water to drink. Instead,45 says women should get about 2.7 litres (升)of water a day,46 that men should get about 3.7 litres. In each 47 , that is more than eight glasses. As you might 48, the report says people need to drink more water 49 they are doing physical(体力的) work. The same is true of those who live in hot weather. These people could need much more water 50 others. 第41题应选：

A.when

B.where

C.what