動(dòng)物對(duì)于現(xiàn)在的我們來(lái)說(shuō)可以分為明顯的兩類(lèi):一種是家養(yǎng)動(dòng)物(domestic animal),另外一種是野生動(dòng)物(wild animal)。與人類(lèi)生活在一起的是寵物(pet)和家畜(livestock),它們都受到了人類(lèi)的喜愛(ài)。
大家都知道,早的動(dòng)物出現(xiàn)在水里,之后的某個(gè)特定階段出現(xiàn)了較高級(jí)的兩棲類(lèi)動(dòng)物(amphibian),常見(jiàn)的有青蛙(frog)和蟾蛛(toad)。
兩棲類(lèi)動(dòng)物繼續(xù)向前進(jìn)化就出現(xiàn)了爬行類(lèi)動(dòng)物(reptile),常見(jiàn)的有:lizard, turtle, crocodile, alligator, snake,They have got cold blood. They all lay eggs and their skin is thick.
之后當(dāng)然要提及我們?nèi)祟?lèi)所屬的哺乳類(lèi)動(dòng)物(mammal)。They give milk to their babies. They have got warmblood.
接下來(lái)是鳥(niǎo)類(lèi) (bird),常見(jiàn)的小到蜂鳥(niǎo) (hummingbird),大到鴕鳥(niǎo)(ostrich),還有兇猛的鷹(hawk),以及家禽類(lèi)動(dòng)物鴨和鵝(duck and goose)。They lay eggs. Many of them can fly. Their blood is warm. 高分回答
A fish is an exothermic vertebrate that lives in the water and has fins, which are structures used for moving. In addition, most fishes obtain oxygen through gills, and have scales. Scales are thin, overlapping plates that cover the skin of a fish. They are made of a hard substance similar to that of your fingernails. 魚(yú)是一種生活在水中會(huì)發(fā)熱的脊椎動(dòng)物,用鰭游動(dòng)。另外,大多數(shù)魚(yú)通過(guò)鰓獲取氧氣,有魚(yú)鱗。魚(yú)鱗是薄薄的重疊覆蓋在魚(yú)皮膚表面的小片。它們由質(zhì)地非常堅(jiān)硬的物質(zhì)而成,類(lèi)似人類(lèi)的指甲。
People used to think that oceans and rivers are having a limitless supply of fish. Recently, though, overfishing has drastically reduced populations of the Atlantic codfish, Pacific salmon, and many other fish species. Some countries are trying to stop overfishing.
人們?cè)J(rèn)為海洋與河流能提供無(wú)窮無(wú)盡的魚(yú)。然而,近的過(guò)度捕魚(yú)已經(jīng)徹底地減少了大西洋M魚(yú)、太平洋大馬哈魚(yú)和其他很多魚(yú)類(lèi)的數(shù)量。一些國(guó)家正努力停止過(guò)度捕魚(yú)。
The United States, Canada, and other countries have recently set limits on the amounts of certain kinds of fish that can be caught. In addition, some fishes, such as catfish, are being raised in 'fish farms'.This practicereduces the demand for fish caught in rivers and oceans.
美國(guó)、加拿大和其他的國(guó)家近已經(jīng)對(duì)某些種類(lèi)的魚(yú)的捕撈數(shù)量進(jìn)行限制。另外,像ft魚(yú)這樣的一些魚(yú)也已經(jīng)在“漁場(chǎng)”養(yǎng)殖,這就減少了去江河和海洋捕魚(yú)的需求。