Which sentence is the best?

Hi,
I would like to express my views here.
Please allow me to say two things about your sentences.
:)
1) Your sentences should be statements, not question forms.
2) " It is a doubt" is more like Chinese to me.
May I change your sentence like these?---------------

- It is uncertain why the Environment Department does not take the same measure.
- It is unclear why the Environment Department does not take the same measure.
Notes:
" The environment department" can be written as " The department of environment" too.
Hope it helps
PS: I even asked my mom about it for you.
( She is a pure aged British lady.)
Until then, bye for now.

謝謝 ballerina 網友之意見!

本人愚見:

試猜樓主是想講出「 the Environment Department does not take the same measure」找不到其原因，而感到一些「奇怪」，「懊惱」，「不明白」意思。

如是，doubt 是適用的。Even 用It is doubtful都是正確。doubt or doubtful 可用於以下的句子:

It is doubtful that the short and skiny girl could kill the 6 ft tall man who weighed 85 kilograms.

2008-11-11 22:01:23 補充：
建議用:

We are puzzled that the Environment.....
We do not understand why the Environment ...
We are surprised that the Environment....

I think that sentense one is the best because it represents a negative question.
圖片參考：http://tw.yimg.com/i/tw/ugc/rte/smiley_13.gif

我覺得(2)應該係最好
不過呢d要視乎你用係邊度,(1)就係適用於1d informal letter 個度
如果係平時個d就用(2)會好d,一般黎講(2)係用黎寫係嘅,講就會講(1)個個