写一篇500字的作文大概要多长时间【一】
一条绳子有多长呢？如果给你一条绳子，求它的长度，也许你会用你手中的直尺去量它。但可能会不准确，所以我们要用更精确的测量物去测量。
有一天，一位节目主持人向一位五金店老板要了一条绳子，并用尺子测量出大约为32厘米。为了求得更精确的答案，主持人去找他的好友——一位数学教授。教授带着他去了国家物理实验室，在去时的火车上，他们寻问了一位路人，这条绳子有多长？路人打量了一下说：“9英尺”。“没错，差不多”主持人说。
到了国家物理实验室，他们使用了“绳尺”去测量，所为的“绳尺”，其实是一个小机器，它会跟据一个小圆球去测量这条绳子有多长。最后测量的结为319毫米442微米。这个答案使我有点惊讶。“绳子”居然可以测量到微米，实在太厉害了。
回到酒店中，教授让主持人分别用直尺、绳子与地图测量轮，测量了在世界地图上黑撒到卢港的距离，果然这和教授说的一样，不同的测量方法真的会改变结果，结果分别是42厘米、47厘米与65厘米。教授说：“如果我们有更精确地测量方法，测出的长度可能会更长。因为你会深入任何角落和裂缝。所以，这绳子不是光滑的，它有很多褶皱的地方，所以这段绳子有多长，取决于测量的准确程度。”
最后，他们到了海滩，教授不停的让主持人画三角形，这些三角线组成了一个科赫雪花图形。只要图案不断被放大，就会有图形会被不断重复。所以教授认为这一条线也是一样的，所以得出的`结论是：绳子是无限长的！
他们用不同的方法测量出了不同的结果，越用精细的方法，绳子的长度就越准确。所以，我们在生活中要多加仔细，得到更多的知识。
写一篇500字的作文大概要多长时间【二】
On the first day of the rest, mom and dad and I went to ningbo sea world and youngor zoo.
We first came to the sea world. Once in the aquarium, dad took me to see the sea precious animals. Have the hippocampus, giant salamander, heavy sea turtles, and cute little penguins. Overhead transparent glass in all kinds of fish swimming happily in the, I seem to feel also came to the underwater world.
Out of the aquarium, went to the ocean theatre, there are Marine animals.
Walrus in sit-ups, music we call "good", then we show the water ballet, see it stretch your head, around circle, also push the feet, how interesting! From Japan's "three sisters" sea lions, each have each skill: within a will do ten arithmetic, a lifting weights, is another ball player. Next, two beluga whales the staff with mouth top up from the water. Finally, dolphins sang a song for us, that caused a cheer.
Out of the sea world, we went to the youngor zoo. In the zoo, I saw a fierce the east-northern tiger and the tiger, mighty lion and white lion. In the panda garden, I finally met our national treasure, the giant panda. They are naughty flip, also eat bamboo. Beautiful peacock contended for the tail, to show us their beauty.
Travel over, although very tired, but I am very happy!
写一篇500字的作文大概要多长时间【三】
呵呵，这个的离开更离奇，简直就是“愚不可及”！只是因为我学习好，她不好，但我们总在一起玩，所以她觉得我每天在“偷着学”，觉得我不仗义！呵呵呵，我要是有时间早去睡觉了，亲！那有什么闲心去学，还“偷着学”！拜拜，“玉瑾漪”……
如今，在新的学校里，我依然是“1”，与所有同学有着相同的友情，所以没有“2”、也没有“3”、更没有“4”……
哎，回想起来，我的友谊史真是一地碎玻璃，上面有这四个人的泪……
写一篇500字的作文大概要多长时间【四】
May first is a Sunday. And it is the Labor's Day.
My mother said to me:"Open your eyes!And look out of the window. What a fine day! Let's go to park,"So my mother, my classmate and I went to the park.
We took some foods in my schoolbag.
On the way to the park. I saw the blue sky with snow-white clouds. I saw pear trees and some apple trees and so on. Below the trees, there are several kinds of flowers.
It's colorful, blue, red, yellow, pink, purple, orange and white. I saw some balloons and butterflies in the sky. I ate popcorn, cornflakes, banana and lollipop. They were wonderful.
In the afternoon, we went to the zoo. I visited the birds, mice, cats, dogs, budgies, hamsters, rabbits and so on.
May Day is my favorite day.
写一篇500字的作文大概要多长时间【五】
也许是初二下学期，也许是初三上学期，“寒冰翎”与一个男生“好上了”，每天和他腻在一起，啦都拉不开。就连和我们在一起时，都在和他发短信，聊QQ。所以，我们成全了她，让她一直站在他旁边……
