题目

Columbus College, 241 Queen Elizabeth Drive, Kowloon City Memo To: All Staff From: Jakie Mok, Secretary; Sports Development Committee Date: May 20, 2010 A week ago, “Sports for Life” programme was sent to the parents, requiring them to select a sport they wanted their child to play. Since then, our staff have received lots of calls from parents asking for more information about it. Here is a memo (备忘录) for your reference when you answer the phones. Sports 1 : Basketball We expect that this will be the most popular of the four sports. Therefore, students should be advised to si 下列各项与自来水的净化过程无关的是（      ）    A.吸附          B.沉降          C.消毒         D.电解