
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.

Once upona time, two brothers lived in a village. They were both famers and grew corn.The elder brother had many children to feed. The younger brother also had a bigfamily to look after. Although the brothers were poor, they lived happily.

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.

We allknow that rice, wheat and corn are staples, but do you know there is anotherkind of staple food—potatoes? Potatoes have many advantages. Theyare a good source of vitamin C and potassium(鉀). A potato’s vitamin C isas rich as 10 apples. What’s more,potatoes are low in calories(卡路里)-onlythree fourths of the same amount of wheat and corn, according to People’s Daily. Potatoes are easy togrow. It can be grown in both the north and the south during winter, spring andautumn. The plant is also able to bear drought(干旱). Some areas of China arefacing water shortages, so the potato is safe to grow.

Locatedin the mountains about 100 miles from Los Angeles, the Idyllwild Arts Academyis a boarding school for young artists. It offers training in arts, likedrawing, painting, photography and cinema, along with programmes for theperforming arts. The school’s quiet, rural location also makes it a verypeaceful and beautiful place to learn. THE NATIONAL CIRCUS(雜技)SCHOOL

如何挑選既安全又營養(yǎng)的食品,是大眾普遍關心的問題。學會讀懂食品標簽變得越來越重要,那么該如何看懂食品標簽呢?首先看配料表。我國《食品安全國家標準預包裝食品營養(yǎng)標簽通則》規(guī)定,配料表中食品配料名稱按比例從多到少排列,也就是說,前幾種配料就是該食品的主要成分。比如,某種酸奶,它的配料表依次寫著生牛乳、白砂糖等,說明含量最多的是生牛乳,其次是白砂糖。

桃花峪是黃河中下游分界線,把橋建在這里自有講究。我個人的選擇原因,就實用層面來講,自是離老家更近,卻也有非實用層面:是它的外形更時尚更壯觀,名字我也格外鐘愛:桃花峪——黃河——大橋,既明艷又鏗鏘,既堅固又綿長,不是么?

作吳令,備諸苦趣,不知遂昌仙令④,趣復云何?俗語云:“鵠般白,鴉般黑?!庇纱送浦敳幻庖?。人生幾日耳!長林豐草,何所不適,而自苦若是。每看陶潛,非不欲官者,非不丑貧者。但欲官之心,不勝其好適之心;丑貧之心,不勝其厭勞之心,故竟“歸去來兮”,寧乞食而不悔耳。

中國固體廢物的歷史堆存總量高達600億—700億噸,每年新增固體廢物約100億噸。如果以傳統(tǒng)的堆放或填埋方式處置,直接后果就是擠壓和損毀城市用地,并且污染大氣、土壤和地下水,造成周圍環(huán)境的嚴重污染,威脅人們的健康。

政府工作報告2022年有序推進碳達峰碳中和工作●落實碳達峰行動方案推動能源革命,確保能源供應,立足資源稟賦,堅持先立后破、通盤謀劃,推進能源低碳轉型●加強煤炭清潔高效利用,有序減量替代,推動煤電節(jié)能降碳改造、靈活性改造、供熱改造推進大型風光電基地及其配套調節(jié)性電源規(guī)劃建設,提升電網對可再生能源發(fā)電的消納能力

主持人(孫志遠) 中學生在網上能不能交到真正的朋友?我覺得答案是肯定的。同學們有什么想法呢?歡迎大家一起參與討論。張思齊 網絡是虛擬世界,網上交友,不用擔心對方會泄露你的秘密,因而可以袒露自己的真實想法,這樣很容易交到真正的朋友。

意既不可以完全達之以言,“和自然逼真”一個條件在文學上不是做不到嗎?或者我們問得再直截一點,假使語言文字能夠完全傳達情意,假使筆之于書的和存之于心的銖兩悉稱,絲毫不爽,這是不是文學上所應希求的一件事?

At first, I wanted to give up the job becausegetting up too early in the morning made me unhappy. I’ll never forget howtired I felt on my first day, but I’ll never forget sitting together andtalking about our days with my workmates for the first time either. Suddenly, Ifelt good to be a member of them.

13. 渡荊門送別李白渡遠荊門外,來從楚國游。山隨平野盡,江入大荒流。月下飛天鏡,云生結海樓。仍憐故鄉(xiāng)水,萬里送行舟。

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.

彭德懷接著說:“我正從他家門前經過,停止著觀看這種示威。我看這些人一多半已餓個半死,而且我知道這個富人在他的倉里有一萬石以上的米。可是他完全拒絕幫助這些饑餓的人們。我激怒起來了,領導著農民攻打并且沖進他的家里。農民運走了他的倉里的一大半糧,食。以后我想到這件事情時,我不知道當時為什么要那樣做。我只知道他應該把米賣給窮人的,而且如果他不肯這樣做的話,那他們從他這里把米搶走,是很對的。”

2021年5月15日,“天問一號”探測器圓滿著陸火星?!疤靻栆惶枴碧綔y器主要由環(huán)繞器和著陸巡視器(含“祝融號”火星車)兩部分組成。前期,環(huán)繞器是搭載“祝融號”火星車的星際專車。在將“祝融號”火星車安全送達火星后,環(huán)繞器上升至中繼軌道,此后數(shù)月它將變身為通信器,建立起“祝融號”火星車與地球之間的中繼通信。

閱讀下面的宋詞,完成下面小題。菩薩蠻黃庭堅半煙半雨溪橋畔,漁翁醉著無人喚。疏懶意何長,春風花草香。江山如有待,此意陶潛解。問我去何之,君行到自知。(選自《全宋詞》)

國家高山滑雪中心位于北京市延慶區(qū)燕山山脈最西段,這里年平均氣溫比北京市區(qū)低3~4℃。位于延慶賽區(qū)核心區(qū)的小海陀山,平均氣溫比延慶還低十幾攝氏度,得天獨厚的條件讓它成為2022年北京冬奧會高山滑雪和雪車雪橇賽場。高山滑雪賽道的出發(fā)平臺,海拔2198米,是北京市海拔最高的建筑,造型巍峨,猶如一只乘風欲飛的風箏。
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