求一篇青蛙的生长过程英语作文!!

求一篇青蛙的生长过程英语作文!!,第1张

The batrachians are refer to the frog (black spot frog), the toad (popular name toad) and so on do not have the tail amphibian, they are belong to the chordate gate, the vertebrate subdivision, the amphibia in the classificationBecause skin exposed, cannot prevent in vivo moisture content effectively the evaporation, therefore their life to not the boiling water or the moist environment, feared is arid and is coldTherefore the majority of lives in the tropics and the temperate zone multi-rain area, distribute in the frigid zone type are extremely fewOur country's batrachians have about 130 kinds, they nearly all are eliminate the forest and the farmland harmful insect's expert In the farmland the common batrachians have black spot frog, rana limnocharis, gold thread frog, flowered back toad and so onThe bullfrog introduces which from Cuba may be in the frog “the giant”, the body long may amount to 20 centimetersIts that moo moo cry sound looks like the cow to call very much, therefore is called the bullfrog其实我国也有身体很大的蛙,例如生活在江南稻田中的虎纹蛙,身长超过12厘米,鸣声犹如狗叫。The life in the Chiangnan mountain stream brook thorn frog, is called “the stone chicken”, the body long also has about 12 centimetersThen our country smallest frog has in a big way Only compared to broad bean slightly bigFebruary in early spring, when north the wind and snow occur simultaneously, in Hainan Island the fresh flower was already in full bloomBy now, daytime might hear nearby the rice paddy “quack quack” the cry soundThis is of a - - microhyla ornata smallest batrachians is seeking a mateThe height only then 25 centimeters, when sounds, the pharynx and larynx lower part meets the drum to leave a big air bubble - - to call the pouchSometimes, you also may hear transmits intermittently from the water plant between “psst” the sound, that is the small frog which one kind not easy to discover - - floats frog's cry soundFloats the frog is pessimistic, the height only then 2 centimeters, often drift between the water plant, only reveals a headAs soon as has the sound of something astir, immediately dives runs awayDo not look these frog body is small, they are the small harmful insect and termite's natural enemyThe tree frog has several kinds approximately in our country, they lithe thin and small, refers to the end to have the sucker, the friendly climb big bough or the diminutive shrubbery, the body color and the environment is consistent The batrachians reproduction characteristic is in the dioecism, the water the fertilization, belongs to the egg to liveReproduction time approximately in every year mid-April在生殖过程中,蛙类有一个非常特殊的现象 -- 抱对。Needs to explain, batrachians hugging to is not in carries on the copulation, only is in a reproduction process link, the research indicated, if artificial separates the female and male frog (ie has not hugged to process), even if then is in frog's nursery stage, the female frog cannot discharge the egg cellObviously hugs to the biology significance, mainly is through hugs to, may urge the female frog ovulationThe general batrachians all spawn in the water, the fertilization, after the egg hatch turn the tadpole, lives in the water, then turns the young frog debarkation activityBut the tree frog spawns the method to be out of the ordinary, the spot leg tree frog delivers egg probably group white soapsuds, also looks like group cream, sticks on the water plantMost interesting is the Omei tree frog, it produces the egg block on the water's edge leaf, the egg on grows in the egg block, then falls to the lake in, continues to grow又如鸣声悦耳的d琴蛙,在产卵前还会先筑一个泥窝,然后把卵产在里面。Somewhat belongs to tree frog's batrachians on not to set up, but is the life in the waterSome tree frog like red web tree frog and the black web tree frog, refers to, between the foot has the spacious web, can unfold the web glide by the high place branch to the low spot, therefore is called the tree frogHas the sucker batrachians besides the tree frog, but also has the hyla arborea and the staurois rickettiIn which quite is special by the staurois ricketti, they like living in the rapids waters, can pass through the jet stream agilely, crawls ascends the rockStaurois ricketti's tadpole very is also unusual, its abdomen has a sucker, can adsorb on the rock, in order to avoid is flushed away by the jet streamHas “the beard” the toad is our country unique precious batrachians, discovered most early in Mt Omei, afterwards one after another discovered in south several provincesThis kind of frog kisses a width to be round, to be flat, the male upper jaw reason has zhui shape cutin black thorn 12-16, therefore is called the beard toadThese “beard” function at present also during people's researchFrog's type are very many, but no matter which one kind, all mainly take the harmful insect as the food The batrachians besides have the very big contribution to the agricultural production, but also has other usesAlthough toad's appearance ugly moreover has the fetid odor, but because on its skin has the root multi-lumps suddenly, can secrete one kind of venomThis kind of venom may make the dried toad venom, is many kinds of medicine raw material, it is said has the hematischesis, the sterilization, the platoon poison, the detumescent effectChinese native medicine prepared medicine and so on six spirits pill, dried toad venom pill, all include the dried toad venomThe rana limnocharis can treat scabies, has the solution internal poisoning caused by damp effect, the rana tigrina rugulosa can treat the young child childhood disease with anemia sicknessThe Chinese forest frog is produces in northeast's one kind of batrachians, withdraws the Chinese forest frog oil from its oviduct, is one kind of food supplement, may govern the lacking in vital energy to be physically weak, the energy loses money, the memory drops post-natal, lacks the breast and so on sickness, the meat may eatNow our country already started to raise the Chinese forest frogThe bullfrog body pork is fat, the flavor is tasty, may raise takes the non-staple food productOverseas had the bullfrog canned food sell Is warm along with the weather slow idle run, the hibernation frog starts to regain consciousnessIt is well known, the frog is preying on the harmful insect, the protection farmland and maintains the ecological equilibrium aspect, is playing the inestimable role, therefore we should promote with great effort the protection frogAlthough the agriculture department once has sent out the protection frog's instruction, but because some local people have were addicted to the food frog meat custom, to protects the frog execution insufficiently to be also thoroughTherefore we initiate, while propagandizes protection frog's vigorously, the development raises the frog industry, raises some body pork many frogs to plant, both has protected the farmland frog, and has met people's needs

it的用法

一、概述

在英语中,it的使用相当广泛,它既可用作代词,如人称代词(personal it)、指示代词(demonstrative it)及非人称代词(impersonal it), 也可用作引导词(anticipatory it)和强调结构中的强调词(emphatic it)

Someone is ringing the doorbell Go and see who it is有人在按门铃。去看看是谁。(人称代词)

What’s this这是什么?

It’s a book这是一本书。(指示代词)

What a long way it is from Beijing to London! 从北京到伦敦真远。(非人称代词)

It's best to plant trees in spring because it's warmer春天是植树的最佳时节,因为天气更暖和。(作引导词)

It was I who met him in the park last week 是我上星期在公园遇到他的。(强调结构中的强调词)

二、it作代词

1、用作人称代词(personal it)

代替前文提到过的事物,it作真实主语或宾语

The frog is not a warm-blooded animal It is a cold-blooded one青蛙不是温血动物,它是冷血动物。

My pen is missing I can't find it anywhere 我的笔丢了,我哪儿也找不到它了。

I won't be back tonight Please tell my wife about it 我今晚不回来了,请你向我妻子说一声。

I was disappointed with the film I had expected it to be much better 我对这部**很失望,我曾盼望它更好。

Tom's mother kept telling him that he should work harder, but it didn't help汤姆的妈妈不停地告诉他要努力,但这没起作用。

2、用作指示代词(demonstrative it)

相当于this或that,it有时不特指某件东西,而代表前面已提到的或将会发生的某件事情。

-Who is knocking at the door —谁在敲门?

-It's me —是我。

I had a talk with the student It was very helpful to her 我和那个学生谈了次话,对她非常有帮助。

It happened during my stay in the United States 事情发生在我在美国的时候。

-Whose exercise book is that —谁的作业本?

-It's his —是他的。

3、用作非人称代词(impersonal it)

代词it可用来指除人以外的一切生物和事物,无阴阳性之分。可指时间、距离、度量、价值、自然现象(天气、气体、阴暗等)。

-What's the time —“几点了?”

-It's half past ten —“十点半”(指时间)

It is late autumn now 现在是深秋。(指时间)

It is rather cold today, isn't it今天很冷,是不是?(指天气)

-How far is it from here to the station —从这儿到车站有多远?

-It's about two kilometers -大约两公里。(指距离)

It is raining hard 雨下得很大。(指自然现象)

-What's the cost of the dictionary 那本词典多少钱?

It is sixty-three 六十三元(指价值)

It did not snow much last winter 去年冬天雪下得不多。(指自然现象)

三、it作引导词

1、作形式主语(formal subject)

当主语是动词不定式短语、动词的-ing形式短语和主语从句时,为了避免头重脚轻,往往把主语放在谓语动词之后,习惯上用it作形式主语来指代后面的真实主语。这个it称为引导词(anticipatory)it,作形式主语,放在谓语动词后的主语是真正的主语。

(1) 代替不定式短语

Is it necessary to complete the design before National Day 国庆节前完成这个设计有必要么?

In fact, it is a hard job for the police to keep order in an important football match事实上,在重要的足球比赛时,警察维持秩序很困难。

It's not easy to finish the work in two days 两天之内完成这个工作不容易。

It is better to build houses on rock than on sand 把房屋建在岩石上比建在沙地上要好。

It is necessary to use a short-wave radio使用短波收音机很有必要。

It is not a good habit to stay up late开夜车不是个好习惯。

(2)代替动词-ing形式短语

It is no use crying over spilt milk覆水难收。

It is dangerous walking on thin ice在薄冰上行走是危险的。

It won't be any help my going with you我跟你去也没什么帮助。

Is it any good trying again再试一次有用吗?

(3)代替主语从句

It is a fact that English is being accepted as an international language事实上,英语是公认的国际语言。

It is a pity that you didn't go to see the movie你没去看这个**, 真是可惜。

Has it been decided when we are to hold the sports meet我们啥时候开运动会决定了没有?

It is known to all that Christopher Columbus discovered America in 1492众所周知,克里斯托夫•哥伦布于1492年发现了美洲。

Does it matter if he can't finish the job on time如果他不能按时完成那工作要紧吗?

2、作形式宾语(formal object)

当复合宾语中的宾语是动词不定式、动词-ing形式短语、宾语从句时,往往把宾语放在它的补足语的后面,而把引导词it放在全句谓语动词和宾语补足语的中间。放在宾语补足语后面的宾语叫真正宾语,放在全句谓语动词和宾语补足语中间的引导词it叫形式宾语。

(1)it代替不定式短语

I don't think it possible to master a foreign language without much memory work 我认为不进行大量的记忆学好英语是不可能的。

He feels it his duty to help others他感到帮助别人是他的职责。

She found it very difficult to answer the question她发现很难回答这个问题。

People in the west make it a rule to buy Christmas presents for their relatives and friends西方国家的人们习惯为他们的亲戚朋友买圣诞礼物。

The little boy found it very interesting to study English那小男孩发现学英语很有趣。

(2)it代替动词-ing形式短语

I think it no use telling them我认为告诉他们没用。

Do you consider it necessary sending more people over你觉得再派一些人去有必要吗?

We think it a waste arguing with him我们认为和他争吵是浪费时间。

(3)it代替从句

I hate it when people talk with their mouths full我讨厌人们说话时嘴里吃东西。

They want to make it clear to the public that they do an important and necessary job他们想向公众表明,他们所做的工作既重要又有必要。

We think it necessary that we (should) attend the meeting我们认为我们去参加那个会议很有必要。

They found it strange that no one would take the money他们感到奇怪,谁也不要这笔钱。

四、it用在强调结构中

当我们要强调句子的某一部分(通常总是主语,宾语或状语)时,常用强调结构。其形式为“it is (was)+被强调的部分+who(that)+句子的其它成分”。在这种结构中,it无实际意义,它只帮助改变一个句子的结构,使某一成分受到强调。如I told her the news at the gate yesterday 这个句子就可借助it改为下列几种形式,各强调一个不同的成分。

1、强调的成分

(1)强调主语

It was I that told her the news at the gate yesterday 昨天在大门口告诉她这个消息的是我。

It is the ability to do the job that matters not where you come from or what you are是你的能力很重要,而不是你从哪来或者你是谁。

(2)强调宾语

It was her that I told the news at the gate yesterday昨天在大门口我告诉消息的是她。

It was a pen that he bought in the shop yesterday他昨天在哪家商店里买的是一支笔。

(3)强调地点状语

It was at the gate that I told her the news yesterday 我昨天是在大门口告诉她这个消息的。

It was in the bookstore that I met your brother the other day.(上海1990)

前几天我是在书店遇到你哥哥的。

(4)强调时间状语

It was yesterday that I told her the news at the gate 我是昨天在大门口告诉她这个消息的。

It was not until 1920 that regular radio broadcasts began直到1920年才开始正规的收音机广播。

It was not until she took off her dark glasses that I realized that she was a famous film star 直到她拿下墨镜我才认出她是著名的影星。

It was about 600 years ago that the first clock with a face and an hour hand was made 早在600年前第一座带有表面和时针的钟就造出来了。

2、使用“It is/was…that”强调句型要注意的几点

(1)被强调部分指人时,其后除了用that之外,也可用who或whom。强调的是主语时,使用who;强调的是宾语时,使用whom。

It was Mary who picked up the wallet 是玛丽拾到了那个钱包。

It was one of my old schoolmates whom I visited yesterday 我昨天去看的是我的一位老校友。

It was Jack that I met in the park last week我上星期在公园遇到的是杰克。

It was her that I met in the park yesterday昨天在公园时里我遇到的是她。

(2)强调句的时态

一般说来,原句的谓语动词如果是现在或将来各种时态,则用句型“It is that(who, whom) 。”如果原句谓语动词是过去各种时态,则用句型“It was that(who, whom)”

It was only when I reread his poems recently that I began to appreciate their beauty只是在最近我在读他的诗时才开始欣赏到它的美。

It is Smith who is leaving for Beijing tomorrow是史密斯先生明天去北京。

(3)在强调时间、地点、原因或方式状语时,不能用when、where、why或how,只用that。

It was because her mother was ill that she didn't go with us就是因为她母亲病了,她才没跟我们一起去。

It was in Shanghai that the Chinese Communist Party was founded on July 1, 1921中国***是在上海于1921年7月1日建立的。

注意:可用“It is/was because…that…”结构强调because引导的原因状语从句,如上例所示,但不能用该结构强调由since或as引导的原因状语从句,如不能说:It is everybody is here that let's begin our discussion也不能说: It was as it was raining hard that they had to stay at home

(4)强调“notuntil”结构

在强调“notuntil”结构中由until短语(或从句)表示的时间状语时,要用固定的强调句型“It is/was not until that 。” 其中that从句中的谓语动词用肯定式。

My father did not come until 12 o’clock last night

It was not until 12 o'clock last night that my father came home昨晚直到十二点我父亲才回家。

It was not until his father came in that the boy began to prepare his lessons.直到她爸爸进来时,那个男孩才开始复习功课。

It was not until she came to see us that we knew her mother was ill in bed.直到她来看我们时,我才知道她妈妈卧病在床。

(5)在强调一般疑问句中的某一成分时,主句要用一般疑问句的语序。

Did this happen in Guangzhou

Was it in Guangzhou that this happened 此事是在广州发生的吗?

Was it in 1969 that the American astronaut succeeded in landing on the moon?是在1969年美国宇航员成功登上月球的吗?

(6)特殊疑问句中只有疑问词可以强调,其强调结构是:“疑问词+is/was it +that … ?”

When did you get to know her

When was it that you got to know her你是在什么时候认识她的?

(7)可以强调方式状语和以because引导的原因状语从句。

It was unwillingly that he did it for me 他是不情愿地替我做的那件事。

It was because he was ill that we had to come back early正是因为他病了,我们才不得不早归。

(8)可以强调宾语补足语,当连系动词不是be,表语部分是名词性词组时,也可使用这种结构强调表语,但是,当连系动词是be时,不能强调表语。

It is white that they painted the house 他们把房子漆成的是白色。(强调宾语补足语)

It is a chief engineer that he becomes now 他现在担任的是总工程师。(强调表语)

(9)强调句的谓语动词除了可采用现在时和过去时的单数形式外,有时根据需要还可采用复杂的形式。

It must have been Mary that you saw just now 你刚才看到的一定是玛丽。

[扬子晚报网消息] 我经常在菜场或路边听到叫卖青蛙的吆喝声,看到一张张血淋淋的青蛙皮时,我心痛不已,严重时当场就吐了。我一直想不明白,人们知道青蛙是益虫,还有那么多的广告说要保护青蛙,《中华人民共和国野生动物保护法》也有保护青蛙的内容,可为什么还有那么多人捕捉、买卖青蛙呢?

青蛙是个捉虫能手:一只青蛙一年可捕食5-40万只蛀虫,还是稻飞虱、苍蝇、蚊子等害虫的克星。想想看如果人们捕捉一只青蛙,那么一年会有多少害虫得以逃生?“春捕一只蛙,秋少一担谷”说的就是这个道理。而且,如果一块田地养100只青蛙捕虫,要比农药的效果好得多。用农药的话,庄稼会被严重污染,人吃了会中毒生病,严重的还会导致死亡。由此可见,青蛙对人类和庄稼是多么重要。如果不保护青蛙的话,就会发生虫灾,稻飞虱迅速繁殖,庄稼也就颗粒无收。

青蛙还是个歌唱家:不管白天黑夜青蛙都能给人带来乐趣,青蛙一起叫,就像个大合唱,是段美妙的交响曲。

而现在人们就为了一点美味,捕杀、买卖青蛙,使得青蛙的数量越来越少,害虫的数量越来越多。人们应该好好反省。

大家一起来保护“地面除害专家”——青蛙吧!

南京市琅琊路小学三(3)班 钱维周

点评:小作者从孩子的视角观察社会,通过列举事例说明青蛙的益处,从而告诉人们要保护青蛙。全文思路清晰,内容充实,语言流畅,并运用多种句式和俗语,是一篇佳作。

人们最常见的蛙是青蛙。青蛙是和人类关系最密切,也是最容易观察到的蛙类。在我国,除新疆、西藏、云南等省不产青蛙外,其余各地均有分布。青蛙确切地说是指蛙科中的黑斑蛙、金线蛙等中小型种类。这些蛙体长约有5-8厘米,大都皮肤平滑,体色多以青绿色、黄褐色为主,并夹杂着不同深浅的黄褐色。背部、体侧及腿上有黑色斑纹和斑块的是黑斑蛙(Rana nigromaculata);背部无黑斑,两道侧褶呈棕**的是金线蛙(Rana plancyi)。雄蛙嘴角旁有一对咽侧外声囊,鸣叫时有节奏地一鼓一瘪,伴以“呱-呱-呱”的鸣声,在乡村稻田里常能循着它们的鸣声觅得其身影,因此青蛙又俗称为“田鸡”。

俗话说:“蛙满塘,稻满仓。” 平日里,青蛙常常一声不响地趴在荷塘、草丛及浅洼中,鼓起一对大眼睛,宁静地注视着周围的情况,伺机捕捉视野范围内的任何猎物。青蛙捕食昆虫既填饱了肚子又保护了庄稼。它的舌头又长又宽,前端分叉,舌面上分泌有黏滑的液体,可以把昆虫粘住。更妙的是,它的舌根不像其他动物那样长在口腔的喉部,而是长在下颌的前面,舌尖翻向咽喉。捕虫时,舌头像d簧一样向外一翻,灵敏地粘住昆虫后便迅速d回,昆虫转瞬间就成了腹中餐,整个过程大约015秒,肉眼几乎无法看清楚全过程。青蛙的捕虫能力和食量相当惊人,每只青蛙平均一天可捕食50-120只昆虫,且多半以上为蚊子、苍蝇、螟虫、蝼蛄、椿象等农业害虫。

青蛙后腿修长且发达,非常善于跳跃,游泳时又可以充当“推进器”,双腿在水中一蹬,便可快速游走。青蛙还有冬眠的习性,每逢秋末它们便会钻进潮湿的泥土里冬眠。冬去春来,万物复苏之际,池塘里准会响起悦耳的蛙鸣

人们对蟾蜍的印象并不是很好,认为它身上长“癞”,十分难看,所以俗称“癞蛤蟆”。实际上,蟾蜍也是蛙类的一种。蟾蜍科的蛙类广泛分布于全世界,共有350多种。它们身体比较胖,四肢粗短,背面布有大小不一、垒状突起的疣粒,善于在地面爬行活动,不善跳跃,眼后有一对突出的腺体,称之为耳后腺。由于其身手不如青蛙敏捷,在遇到敌害时身上的疣和耳后腺能分泌白色的毒液,以保全自己,这种防身术是青蛙所不及的。蟾蜍的捕食行为也十分有趣,在发现地面上的昆虫时,立即静止不动,两眼专注地盯着猎物,只要猎物一动便突然伸出舌头将食物卷入口中,捕虫的本领并不亚于青蛙。

我国常见的蟾蜍有中华大蟾蜍、黑眶蟾蜍和花背蟾蜍等种类。其中,中华大蟾蜍(Bufo gargarizans)分布最广,也最常见。为国产蟾蜍中体型最大者,雌蟾体长达12厘米。体色随着分布地点、性别及季节而有所不同。眼后部长椭圆型的耳后腺突起发达,所分泌的白色浆液经加工可制成“蟾酥”,具有解毒散肿的疗效。分布于东南、西南和华南地区的黑眶蟾蜍(Bufo melanostictus),头部具有黑色骨质棱,形似黑色的眼眶,趾端黑色。雄蟾鸣叫时咽下声囊鼓出并急促地振动发出“咯咯咯”的声音,繁殖期时常数百只聚集在一个坑洼里,群蟾争鸣,甚是喧闹。见于西北、东北、华北等地的花背蟾蜍(Bufo raddei),体形较小,约有6厘米。外表看起来比其他蟾蜍漂亮、可爱些:身上密集的疣粒上点缀着小红点,背面布满了明显的酱色花斑。这种蟾蜍对环境的适应性极强,在半荒漠地区和盐碱沼泽地里也能安家。繁殖季节时常能听到雄蟾短促的“咕呵-咕呵”的阵阵叫声

蛙类中有些成员模样长得介于蟾蜍和青蛙之间,产于我国东北和朝鲜的东方铃蟾就是其中一种:背部绿色布满黑斑如青蛙,身上的粗糙疣粒却又像蟾蜍,实际上它却独属一科——铃蟾科。铃蟾是一种北方的原始蛙类,见于欧亚大陆,共有11种。舌头呈圆盘状,无法d出是它们的典型特征。

我国共有4种铃蟾,常见的东方铃蟾(Bombina orientalis)体长约4厘米,趾部红色如同涂上了红指甲油。半水栖性,主要分布于山地林区,常栖息在溪流、水沟及草丛。背部绿色是一种保护色,也能分泌毒液,当遇到敌人时,小小的铃蟾也会利用肢体语言来表达自己的“感情”:仰面朝天露出有鲜艳花斑的红肚皮,以警告天敌:“别动我!”

一般人们所通称的青蛙或蛤蟆(蟾蜍),在动物分类学上隶属于两栖纲,无尾目,它们早在三叠纪便已经出现,直到现代仍然是两栖动物中最为繁盛的一类。除了两极、大洋和极端干旱的沙漠以外,世界各地都能见到蛙的身影,热带地区和南半球种类最为丰富。全世界共有3900多种,分布于中国的有260多种。无尾目动物具有两栖纲的典型特征:幼体(蝌蚪)有尾无足,在水中生活,用腮呼吸;成体无尾而具四肢,后肢长于前肢,不少种类善于跳跃,用肺或皮肤呼吸。

无尾目的成员统称蛙和蟾蜍,但蛙和蟾蜍这两个词并不是科学意义上的划分。从狭义上划分,二者分别是蛙科和蟾蜍科的成员,但是无尾目却有27个科,而其成员都冠以蛙和蟾蜍的称呼。一般来说,皮肤比较光滑、身体比较苗条而善于跳跃的称为蛙,而皮肤比较粗糙、身体比较臃肿而不善跳跃的称为蟾蜍,实际上有些科同时具有这两类成员的特征。所以人们在描述无尾目的动物时,统称它们为“蛙”。当然,蛙类家族中的成员还远不止这些,但毫无疑问的是目前所有野生蛙类的群数量仍在不断减少。由于蛙类对环境的变化十分敏感,一直被认为是有预警作用的环境指示针。湿地的不断缩减造成的栖息地丧失,化肥和杀虫剂的大量使用导致的化学污染,人类因嘴馋和利益的驱使进行的捕杀都威胁着蛙类的生存。希望通过认识这些可爱的蛙类朋友,能唤起更多人来关注它们的命运。

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