红豆杉的作用 1、国家一级重点保护植物南方红豆杉的次生代谢产物紫杉醇,是广谱、低毒、高效的抗癌新药,被医学界公认为是人类近二十年来抗癌药物的最大发现。其独特的抗癌机理是可特异地促进微管蛋白的聚合,阻断细胞分裂,杀死癌细胞。对颈部肿瘤、胃癌、肺癌、食道癌、结肠癌、乳腺癌、卵巢癌有较好的疗效。特别...
一、人为的分类植物分类学是植物科学中产生最早和最基本的科学。自从人类有了利用植物的活动,也就有了植物分类知识的萌芽。任何科学的发展都受到当时社会生产力的水平、科学技术的发展水平,以及当时社会的伦理道德观念等各方面的影响和制约。回顾植物分类学的发展史,可以大体上把植物分类分成林奈以前(约公元前30...
森林之于地球是非常重要的,它的重要性表现在哪些放面呢?涵养水源,保持水土:雨水降落到森林后,首先会受到树冠的阻留,顺着树干流到地面后,再被盘根错节的树根缠住,又因森林土质疏松,一部分水又渗入地下,成为地下水,这样,从地表直接形成径流的水就减少了许多,不易造成山洪,避免大水冲刷地表导致水土流失。净...
今天是植树节,一大早,我便兴致勃勃地朝目的地——曲江公园进发了。一到那儿,首先映入我眼帘的是矗立在广场的大石碑,碑前一群老爷爷老奶奶载歌载舞,谈笑之声不绝于耳。他们的舞姿美妙多姿,强健有力,看起来仿佛是充满朝气的少男少女。绕过石碑,便看到了老师和同学。他们有的谈笑风生,其...
诸葛亮与桑树为建立蜀国立下汗马功劳的诸葛亮,在病危时给后主刘禅的遗书上写道:“臣家有桑八百株,子孙衣食,自可足用。”他把自己栽种八百株桑树作为子女生活费的来源,为子女生活作长久安排。一代名相,两袖清风,死后留给子孙唯有自己栽种的桑树,令人不胜感慨。楚霸王与桂树楚霸王自幼爱...
“圣诞节”这个名称是“基督弥撒”的缩写。弥撒是教会的一种礼拜仪式。圣诞节是一个宗教节日,我们把它当作耶苏的诞辰来庆祝,因而又名耶诞节。这一天,世界所有的基督教会都举行特別的礼拜仪式,但是有很多圣诞节的欢庆活动和宗教并无半点关联。交换礼物,寄圣诞卡,...
美国在世界各国中,美国可以说是受毒品威胁最严重的国家,美国在对待吸毒行为方面有两个特点,一是变化比较大;二是各州有不同的一些法律规定。美国的蒙大拿州在1899年规定对吸毒者处以小额罚款,被认为是对吸毒行为最早的处罚规定。其后著名的联邦禁毒法《哈里森麻醉品税法》规定,在无药方配制情况下使用毒品为非...
①区分名词和非名词,名词前不能加“不”和“很”。②区分形容词和动词,形容词可以用“很”来修饰,动词前不能加“很”(表示心理活动的动词除外)③区分形容词和副词,形容词能修饰名词,前面能加“很...
放眼现在,历史的风吹开了中国崭新的一页,中国人挺直腰杆,发出豪迈的声音:“我们站起来了!”任何困难都阻挡不了我们前进的脚步。我们伟大的祖国犹如一条巨龙开始在世界腾飞。而随着起点的上升,咱们中国梦应该要变得日益伟大,21世纪的中国梦是强盛中国之梦,生态中国之梦,和谐中国之梦...
Dont gild the lily 不要给百合花镀金 画蛇添足。 (英国剧作家 莎士比亚 W )I can live for two months on a good compliment (Mark Twain , American writer)只凭一句赞美的话我就可以充实地活上...
They were to eat peaches, as planned, after her nap, and now she sat across from the man who would have been a total stranger except that he was in...
Wendy clutched her Slime Sisters comic book She saved her allowance to buy all kinds of things that were in the back of the comic She had bought t...
This was an emotional day The ceremonies honoring the fortieth anniversary of D day became more than commemorations They became celebrations of hero...
THE ROAD NOT TAKENRobert FrostTwo roads diverged in a yellow wood,And sorry I could not travel bothAnd be one traveler, long I stoodAnd looked down...
STUDY 学习篇Eternal truths will be neither true nor eternal unless they have fresh meaning for every new social situation (Franklin Roosevelt , Ameri...
A great poem is a fountain forever overflowing with the waters of wisdom and delight (P B Shelley , British poet )伟大的诗篇即是永远喷出智慧和欢欣之水的喷泉。(英国诗人 雪莱 ...
The Mirror and I 我和镜子I like to look into the mirror I remember when I was a little girl, I often stood on my toes, trying to find my face in the mi...
Little Robert asked his mother for two cents What did you do with the money I gave you yesterday?I gave it to a poor old woman, he answered Yo...
I am a teacher! I am a teacher, first, last, always! The Prime of Miss Jean Brodie (1969) – Jean Brodie (Maggie Smith)“我是一名教师!我是一名教师,这...
“They’re going to kick me out of my own home,” said Karl Berger, 86 years old Karl is a widower with no living children When Kar...
Out behind the big red barn at the edge of the walnut grove is a most magnificent pond shaded by an old oak tree Ill tell you right now, before its...
THE VALUE OF TIMEKatharine SunTo realize the value of one year:Ask a student who has failed a final exam To realize the value of one month:Ask a mot...
It was Christmas 1961 I was teaching in a small town in Ohio where my twenty-seven third graders eagerly anticipated the great day of gifts giving ...
“Why were you so rude to your brother?” Gladys asked “He drove all the way over here to deliver that package to you But you didn...
WHAT IS SUCCESSRalph Waldo EmersonWhat is success?To laugh often and love much;To win the respect of intelligent peopleAnd the affection of children...
THE SIGNIFICANCE OF FAILURERobert H SchullerFailure doesn t mean you are a failure,It does mean you haven t succeeded yet Failure doesn t mean you...
The loomploy population was divided into the able and the unable The able could care for themselves in the darkness of the land The cold did not fr...
A horse and an ass were traveling together The horse was prancing along in its beautiful trappings, but the ass was carrying the heavy weight in it...
TODAY IS A NEW DAYDonna LevineYour tomorrows are as brightas you want to make them There is no reason to carrythe darkness of the pastwith you into...
A wild boar was sharpening his tusks against a tree one day when a fox came by What are you doing that for? asked the fox There are no hunters...