国产精品亚洲lv粉色,久久久久亚洲AV综合波多野结衣,午夜亚洲福利在线老司机

主頁>托福TPO>正文

托福TPO71寫作題目及范文PDF高清下載(綜合+獨立)

2022/7/16 17:21:16來源：新航道作者：新航道

雅思/托福/國際備考寒假班

托福模考，最新時間出爐！

多鄰國英語考試-2024國際學校及出國留學考試新選擇

摘要：托福考試前很多考生通過TPO練習來提高自己的托福解答能力，目前TPO也已經更新到74了，今天新航道上海學校托福小編給為大家先分享TPO71寫作題目及范文PDF高清版(綜合+獨立)，方便大家做考前練習!

托福考試前很多考生通過TPO練習來提高自己的托福解答能力，目前TPO也已經更新到74了，今天新航道上海學校托福 小編給為大家先分享TPO71寫作題目及范文PDF高清版(綜合+獨立)，方便大家做考前練習!

The fossil record shows that members of the group of dinosaurs known as lambeosaurs had large bony crests on top of their heads. The shape of the crests varied from species to species, but all lambeosaur crests contained extended hollow passages. No one really knows exactly what function the crests served, but scientists have offered several theories.

Sense of smell

One theory holds that the primary purpose of the crests was to improve the dinosaurs' sense of smell. Examination of the fossils has suggested that the crests contained many blood vessels. The nose bones of modern animals with a highly developed sense of smell have a similar inner structure characterized by a high density of blood vessels.Thus, it is reasonable to conclude that the crests were primarily used to enhance the sense of smell.

Cooling

A second theory maintains that the crests served to prevent overheating by lowering lambeosaurs' body temperature The addition of a crest had the effect of increasing the surface area of the lambeosaur's body, thereby allowing body heat to escape more rapidly. Other warm-climate dinosaurs, stegosaurs for example, also had bony crestlike plates on parts of their body that increased the body surface area lt has long been believed that the bony plates of stegosaurs were adaptations to improve cooling, so it seems likely that the crests of lambeosaurs served the samepurpose.

Sound

A third possibility is that lambeosaurs used the crests to make sounds, perhaps for communication with other lambeosaurs. lt was definitely possible to make low sounds by forcing air through the crests. This theory is supported by a finding suggesting that lambeosaurs had a good sense of hearing: paleontologists recently discovered remains of a lambeosaur that had a highly developed inner ear. A good sense of hearing would be necessary for animals communicating by sound.

TPO71寫作題目+范文，請掃微信二維碼領取

領取暗號“優化+托福TPO71”