
通常而言,即便是同一種植物,冬季和夏季的抗凍能力也不一樣一在夏季活動期多不耐寒,在冬季休眠期則更為耐寒。這是因為春夏季節(jié),植物生長旺盛,養(yǎng)分消耗多于積累,因而其抗凍能力較弱。如北方的梨樹,在﹣30~﹣20℃低溫下能平安越冬,在春天卻抵擋不住微寒的襲擊;松樹的針葉,冬天能耐﹣30℃的嚴寒,在夏天如果人為地降溫到﹣8℃就會凍死,就是這個道理。

1961年,一位名叫S.M.斯季紹夫的原蘇聯(lián)科學(xué)家發(fā)現(xiàn),如果二氧化硅(即非常純的沙子)處于超高壓的狀態(tài),那么它的原子相距很近,從而變得極為致密。一立方英寸被壓扁的沙子比一立方英寸普通的沙子要重得多。這種被壓扁的沙子因此被稱為“斯石英”。斯石英并不十分穩(wěn)定,原子之間靠得太近以至于它們又出現(xiàn)相互排斥的趨勢,最后又變?yōu)槠胀ㄉ匙印H欢?,由于原子之間結(jié)合得極為致密,所以這種反彈變化進行得非常緩慢,從而使斯石英可保持數(shù)百萬年。

我對雨雖不特別愛好,也不怎樣嫌惡。如果頭戴帽子在不大不小的雨中行走,我并不覺 得難過,毋寧有一種超然的心情。你只要不以打濕衣帽為意,便可悠然不迫而有余情去欣賞那織女機中的雨絲。真的,那就和春蠶剛吐出來的絲一樣光亮、細長,而且整齊地排列著,似乎要把天空和大地縫織起來?! ∧菚r你就像一把梭子,從那些雨絲中穿過。雨不僅可看,而且可聽。聽雨最好是在夜里,沒有市聲混雜,你可以清晰地辨出什么是芭蕉上的雨聲,什么是殘荷上的雨聲。池中之雨清徹,瓦上之雨沉重。傾盆大雨如怒號,霏霏 細雨如嗚咽,一個是英雄氣短,一個是兒女情長。

又轉(zhuǎn)過一個山包,是一大片連著的莊稼地,現(xiàn)在全荒了。轉(zhuǎn)過得水家,月亮看見祠堂了。守祠堂的孤老頭七叔公會點香火。都是歲月,都是故事。前些年,祠堂香火很盛,除了年節(jié)、醮會,村里紅事、白事都在那里上香鳴炮,稟告先人。祠堂,是一個村的中樞,是圣地哩。月亮想起了官廳前面兩塊石碑上刻著的字:月出滿地水,云來一天山。今天是十四,往年這時候,祠堂已經(jīng)開始祭祀的一些儀式了,而眼下,祠堂一片虛空,分明是一個孤獨的老人,正在月光下品著這無邊的寂寞呢。

話是說給他媳婦王鳳鳳的。王鳳鳳知道這是張六九的第一句話。每天到了麻花鋪前,張六九說的第一句話就是這句。每天早起,張六九騎了三輪車收破爛時,第一個到的地方就是街頭的這個麻花鋪,買一根麻花給媳婦吃。剛炸出來的麻花,油乎啦啦的,飄著白騰騰的熱氣,老遠就聞上了香。王鳳鳳喜歡吃麻花。王鳳鳳說,這世上沒有比麻花好吃的了。就她的這一句話,結(jié)婚八年,張六九給她買了八年的麻花。

十多年前筆者曾經(jīng)參加過一次國際論壇。有一位非常年輕的企業(yè)家介紹自己的新公司,經(jīng)營的主要業(yè)務(wù)是“替人讀書”。許多大企業(yè)的管理人員總是非常忙碌,卻又很想讀書。這家公司就為這些想讀書而沒有時間讀書的人把三百頁的大部頭著作精簡成十頁的“精華”。負責摘選和撰寫“精華”的人都是具有高學(xué)歷的研究人員,以保證濃縮的一定是精華。一時間這家公司十分受歡迎,它提供的“精華”摘要,猶如讀書界的營養(yǎng)膠囊,小小一粒,讓人們覺得獲得了所需要的信息和養(yǎng)分,同時大大節(jié)約了時間。

Melatonin(褪黑素) is produced by the body to control when you get sleepy and whenyou wake up. As night falls, the levels of melatonin rise, telling the bodythat it’s time for bed. And the levels naturally fall as daylight comes near,getting you ready to greet the day.

Lu Junling, a security guard from Hebei University, became popularon the Internet. As an ordinary (平凡) person, though Lu Junling is more than 50 years old, hememorizes English vocabulary for CET 6 under the street lights every day justto improve himself. When he is free, he also writes novels and sings operas.That’s not all! Painting, music, kongfu, ancient poems, etc. are all hishobbies. So a number of people call him “treasure security guard (寶藏保安)”. Lu Junling said, “If I want to become an artist, I will alwayswork hard for my dream!” Mr. Lu’s words live in many people’s memory.

Ibelieved that I was right and he was wrong, and Tony believed that I was wrongand he was right. Our teacher, a kind and smart lady, decided to teach us alesson. She brought us to the front of the class and placed him on one side ofher desk and me on the other. In the middle of her desk was a large and roundobject. I could clearly see that it was black. The teacher asked us what colorthe object was. “White,” Tony answered. I couldn’t believe he said the object waswhite! “Clearly, it was black!” Another argument started between Tony and me,this time about the color of the object.

By usingthis method, the study found that red meats were the most unfriendly foods tothe environment. Keeping farm animals produces a large number of methane(甲烷)that keeps 30 times more heat than CO2. As well asmaking the earth warmer, eating too much red meat is known to increase the riskof a few illnesses, such as heart trouble.

B: It’s about theexperiments three astronauts are doing on the space station.A: That’s great. I’minterested in space, so I want to be an astronaut like them.

For a long time, I guarded the garden of peaceand quiet. When the children followed me into the garden, I would expect themto be out of sight (視野). And I would hand out tasks.

All thefamily—my grandparents, my parents, my aunt and uncle, my cousin, my sister andI— ___22___ the turkey. However, turkey is not the easiestthing to ___23___. It takes a lot of time to prepare and a lot ofwork to cook…and there are a lot of chances for things to go wrong.

Each ofthem has their own experience- two people with synesthesia may both “feel”music, but they almost never feel the music in the same way. For example, onemay feel the music of the violin lightly brushing his face; the other may feelit on her ankle (腳踝). And one’s experience of synesthesia is alwaysthe same. If they see the number 5 in the color blue, then 5 is blue every timethey see it.

Tim: _______36_______,Bob.Bob: Good afternoon, Tim. Icalled you just now, but nobody answered. _______37_______?Tim: I went to the cinema.And I watched a movie named The Battle atLake Changjin.Bob: Oh, great. It’s very famous nowadays. _______38_______?

I often use old clothes that people don’t wearany more to make bags. I opened a small shop in my community and set up awebsite to sell the bags online. Many customers think they are fantastic. Now Iplan to write a new book about ways to use old clothes.

Michelle,a famous lady, has found that more than 25% students are too fat in hercountry. It is a very serious problem. So she starts a Health Program to dealwith it. The Health Program is to reduce the number of fat students today andin the future.

Theoil paper umbrella is a traditional Chinese handicraft(手工藝品).It has a history of over 1,000 years in China.In early TangDynasty, it was introduced to Japan and Korea, so it was called the “TangUmbrella”. Later oil paper umbrellas were spread to other Asian countries, suchas Vietnam, Thailand and Laos, and each had its own style. However, assteel-ribbed(鋼骨的)umbrellas appeared in the last century, thehand-made oil paper umbrellas became less used in daily life. They were turnedinto decorative artifacts(裝飾性工藝品).

The fantasticman-made “forest” is a Singapore landmark. It is made from steel and concrete(水泥) covered in localflowers and plants. At night, 18 solar-powered tree-like towers which get theirenergy from the sun often light up the city.

There was an old oak tree in the garden. Holly’sfather wanted to cut it down and build a new office there. Holly felt sad anddidn’t agree. She moved into the old tree house which was her favourite place in the world.One day, it rained all night.
PPT全稱是PowerPoint,LFPPT為你提供免費PPT模板下載資源。讓你10秒輕松搞定幻燈片制作,打造?顏值的豐富演示文稿素材模版合集。