著名的“大陆漂移说”是德国地球物理学家、气象学家魏根纳提出的。他在地图上发现大西泣西岸的南美洲巴西东端呈直角的凸出部分,与东岸非洲喀麦隆海岸凹进去的部分,正好能够对起来,而且巴西沿岸每一凸凹处,与非洲沿岸每一凹凸处几乎都相对应。他思索着:如果移动这两块大陆,使他们靠拢,那么这两个部分正好吻合。他想到这里,心里一亮:“这两个大陆原来可能是一个。”
后来他又经过长期研究,通过地球物理,地质,古生物及古气候多方论证,提出了著名的.“大陆漂移说”。他认为地球大陆原是一个整块,大约距今3亿年以前开始分裂,向东西南北移动,后来才成为现在的样子。
后来科学的新发现,进一步证明了他的学说。
st summer holiday, I took a trip to Yunnan. It is in the southern part of our country .It is really a very beautiful place grand mountains, clean rivers and kind people. Trees and flowers are seen everywhere. Every year there are lots and lots of visitors.Maybe you have heard about Shi Lin (stone forests. There are all kinds of strange stones. Some of the small stones look like graceful girls; and the big stones look like handsome men. Other stones look like cats, peafowls, double-edged swords, mice,
elephants and so on. Of all the stones, the stone like a beautiful girl in a legend is the most famous .Its name is A Shima.
I also went to Li Jiang. The roads in that city are just like the Eight Diagrams. Any road in the city goes to the center of Li Jiang. A river runs through the whole city. If you go along the river, you\'ll never get lost. There are many ethnic minority people in Yunnan. They are very cordial. And they all like singing and dancing. We danced with them around the campfire that night. I really had a good time.
I like the elephants and fruits there best. An elephant is even taller than me! I even mounted the elephant, though I was very afraid at first. But the elephant seemed very friendly. I took some photos with it. The fruits there are very fresh and delicious. They are very good for our health.
The trip to Yunnan impressed me GREatly. I will never forget it.
When holiday comes, thousands of people pour into the tourist sites, they want to relax themselves and enjoy the beautiful scenery. But Chinese people have a bad habit, they like to leave some notes on the site, proving them have been here before. Such a behavior has been criticized by the public, because the leaving note will damage the preservation of the tourist site. Most of the tourist sites are part of our country\'s historical relics, these sites are priceless, it is everyone\'s duty to protect the sites. When we go to travel, we should behave ourselves. First, we need to have the idea that no rubbish being leaved behind when we leave the site. We should take away what we bring, keep the environment clean. Second, no any notes being written in the sites. Though in the old days, Chinese workers like to leave their names on the sites, but now it is a new world, we need to behave ourselves.
你好!
我是一个中国的孩子,你远在加拿大,我在中国,可是我却知道你,敬佩你。
在你6岁的时候,你听老师说非洲的人民连喝一口干净的水也很难,有很多人因为喝了不干净的`水病死的时候,你就产生了个梦想:为非洲人民打造一口井,让他们有干净的水。于是,你做额外的家务活,终于挣到七十元。当你得知挖一口井共需要两千元,你并没有泄气,又继续努力干家务。我以前不相信,一个梦想竟有如此大的力量。现在,我终于明白了,这力量来自你美好的心灵,来自你对梦想的坚持和执着,来自你为实现梦想而付出的努力!不是吗?
我也有梦想,每当别人问我的理想是什么?我就大声说:“以后,我要当钢琴家!”现在我要像你一样为实现梦想而坚定执着的奋斗精神。只有不断努力,不断奋斗,才会实现梦想!
祝:
学习进步!
xx
20xx年5月8日
德国19世纪化学家维勒,是一位在科学上有成就的科学家,他曾先后发现了铝和铍两种元素。但他也有遗憾。有一次,他在研究矿石时,发现了一种化学物质,他没有深入思考,武断地断定它是金属铬。不久,瑞典物理学家、化学家肖夫斯特姆也遇到了这种化合物,他没有轻易放过,而进行了深入的思考研究,终于发现这种金属是钒。维勒得知后,后悔莫及。由于自己的草率,没有认真思考,失去了一种科学发现的良机。
In recent years, tourism has been popular and played an important role in our nation’s economic growth. However, I am afraid that if tourism develops over, it will bring harm to the environment and give rise to many problems.
There are a few reasons accounting for my views and I would like to list three of them. One of the examples is that a large number of woods and other plants were replaced by all kinds of accommodation facilities or scenic spots. That definitely breaks the ecological balance of these areas and destroys the natural beauty of the scenic spots. Worse still, more pressure has been placed environment protection in that many tourists left their garbage in the scenic spots. In addition, over-developed tourism will occupy large numbers of farmland and lead to the shortage of the land.
In a word, tourism will be harmful to our environment if it is over development. Thus, I do not advocate that we development tourism without considering the environment. And we should keep the balance between tourism development and environment protection so that we can achieve the sustainable development between our nation’s economy and the environment.
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