A

题目分析：考查固定句式。There is no doubt that…毫无疑问…；There is no need没有必要…；no wonder难怪；There is no point in doing sth做某事没有意义。句意：毫无疑问在喝酒之前喝点牛奶对于我们的健康是有好处的。故A正确。

点评：本题考查There be结构的几个固定句式。There is no doubt that…毫无疑问…；There is no need没有必要…；There is no point in doing sth做某事没有意义。平时要加强识记。