[字辨] as a whole / on the whole

[freaksome (小布)]

想請問板上高手，on the whole 和 as a whole 該怎麼明確的區分？

例如以下這道題目：

______, the weather down south is better than that in Taipei.

(A) No wonder    (B) As a whole   (C) On a whole   (D) On the whole


有一說為 N + as a whole

但是 The class is well-disciplined as a whole. 也是常見的用法，

希望能請板友簡潔的釋疑，謝謝。

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→ dunchee:http://www.ldoceonline.com/dictionary/whole_2
→ dunchee:2和3
→ freaksome:謝謝d大，但天氣有好有壞，為什麼這題不能用B?
推 tom91002:C選項不就正式有好有壞的意思嗎？"generally true"
→ tom91002:          *是