爲什麽 D major 比 G major 容易？

I think that is an easy key because it has only ONE sharp.That is F#.
D major is easy too. It has only 2 sharps-F# and C#.
On the contrary, I think that G major is easier than D major.
If you think that D major is easier than G major,I think that all the notes of the D major scale is just two semitones higher that C major scale. So it(D major) looks like to be easier than G major.
圖片參考：http://tw.yimg.com/i/tw/ugc/rte/smiley_5.gif


2008-06-15 00:39:00 補充：
I'm sorry, there's some missing of words in the first sentence. It should be written as:
"I think that G major is an easy key because it has only ONE sharp.That is F#."