Water,coffee and cola___healthy...这里不是应该用就近原则..为什么答案是are?.

正式文体中
一关联词语
1there be...
eg：There is a boy in the classroom.这有个男孩在教室里.
2 neither …nor
eg：Neither you nor I am wrong .你和我都没错.
not only处于第一句的句首,这时这个句子的主谓语要倒装.（also也可以省略）
eg：Not only is the book long,but also it is boring.这本书（内容）又长又枯燥
3 either …or
eg：Either they or jim is going to shanghai next Saturday.
4whether…or 是...还是,不管...还是
eg：You may have paid for it,but it is the professor's job to make sure you get what you paid for... whether you like it or not.
5not only…but also
eg：Not only you but(also) he is wrong .不仅你错了,他也错了.
6not…but
eg：Not you but your father is to blame .不是你,而是你父亲该受责备.
二 在倒装句中：谓语可与后面第一个主语一致
非正式文体中
有时依“就近一致原则”,但也可依“意义一致原则”或严格地依“语法一致原则”.e.g.
Neither she nor I were there (意义一致) 我和他当时都不在那儿.（非正式）
Neither she nor I was there .（就近一致）（译文同上句）（正式）
但是,如果依“就近一致原则”而与其他两项原则相矛盾时,则常常认为是不太合符规范的.e.g.
No one except his own supporters agree with him .仅他自己的支持者同意他的意见.（依“就近”和“意义”一致的原则；但语法上,“No one ”才是主语,谓语要改成“agrees”.“写作中”一般要依“语法一致”原则.






基于以上语法知识,所以这个就近原则不适用

这是几个不可数名词并列作主语，看作复数，不是就近原则。
三月应该填 are 。