here are a few reasons:
1）为什么非得用英文？

2）英文用了也就用了，为什么口气要那么的盛气凌人？一副高高在上的样子，好像蔑视任何美丽的和正常的东西。你到底想要说什么？

3）要是自己真NB盛气凌人也就原谅你了，几个问题问的怎么就感觉这么欠扁呢？这都是什么乱七八糟的东西啊？觉得你自己观察仔细，容易发现大自然中的种种问题？说实话上华新这么久也没看到哪个帖子让我这么的气，这么白痴的一对问题一般我也懒得理。也可能是因为刚才考试考的郁闷了心里不痛快，今天还真就想好好教育教育你！

1) Why some leaves are yellow but others are green?

Ans: Some tress never turn yellow even in winter, and even if they do, it's not to say 1,2,3 all the leaves will turn yellow at the same time!

2) Why are there green trees when it is in winter?

Ans: See above answer. And sometimes, snowing is not a definite indicator of winter. Occasionally, it also snow in late autumn or early spring, like Oct or April.

3) Why in winter there are roses?

Ans: See above answer.

4) Why are the fallen leaves ON the snow layer instead of below 'em?

Ans: sometimes, leaves fall after snowing.

5) Why are the leaves not rotten when the snow melts?

Ans: the rotten process is not shown in the pictures.

6) Why are the leaves not drooping when there are snow on 'em?

Ans: "Drooping"? or do you mean dropping? Refer to above answers. And some trees do have higher tolerance level to the coldness of winter.

7) Why are there snow on the car and buses when there is no parking slot nearby?

Ans: Not all cars or buses are parked on parking slots. Yes, i know you might going to say "see the ugly Chinese!", but hey, the lack of parking slot might be due to fast growing economy. Moreover, despite of such fact, we still enjoy the beautiful snow scenes.

8) Assume wind comes from the north, and snow fall on the north side of the trees, why does the sun shine from north also? ;)

Ans: What has the direction of sunshine to do with the direction of the wind? You think there are only wind breeze from the north in winter?

第一次在这里说了这么多英文，对不起大家了。就是看不上那种本来自己没什么水平就喜欢献的！用俺们那块儿的话说，这就叫“的色！”

至少这次说的话没让我那么气。看来这位同志是真的对北方很不了解，介此，本人就以下问题再做答复：

"I thought roses are summer species bcos in movies all the girls dress so little when they receive roses."

这么说的话冬天里的女生就不可以收到玫瑰了？情人节的时候还是冬天呢。刚才又看了一下那些照片，那花好像不是玫瑰啊。

“>>>>Con: That will come after snow melts, since snow will hit the leaves and make them fall, and others will take some time to grow until they fall.”

没看明白你要说什么。反正有些叶子是在下过雪之后才落的啊，倒也不一定是hit by the snow.

“Drooping mean hanging under weight...Think about the leaves after rain...”

我知道drooping 是什么意思，就是没想到snow drooping 会是一个什么效果。没有drooping是因为雪还没有融化。

“Well, when a car has snow on it, it must have been parked somewhere when the snow was falling, and just started a short time, otherwise all snow will melt and blow off.”

刚才说那些话的时候都已经忘了照片里都有什么了。又看了一遍，才明白你是什么意思。我觉得那些车顶本来就是白色的吧，或者也有的时候雪花了由被冻成冰了，不是一片片散落的雪花，这样也就不容易被吹掉了。


“>>>>Con: BJ is in northen hemisphere, so in winter the sun ought to shine from the south, and winds
blow from the north, but in the pic, sunlight and wind in same direction, that is bizzare.;)”

i think i know what you are trying to say here. 只是想让你知道，书本上教的东西不一定总是对的，由于蒙古高原和西伯利亚一代的高气压，中国北方冬天的时候确西风会比较多。可这并不代表就不可以偶尔刮一刮南风。而且一天中的不同时刻太阳照射的方向也是不同的。

希望以后能谦逊一点，不要显示的太傲慢．

think i have to say, it was a louzy immitation.a detective ought to know more than these. :)