★、★★、★★★題難度系數(shù)逐級(jí)提升，學(xué)生可根據(jù)實(shí)際自主選做。

一、圈出句中的錯(cuò)別字，并改正在括號(hào)里?！?/p>

在隧道的未端，一只略顯苯重的大鳥張開羽冀飛向藍(lán)天，似乎是要去開避新的領(lǐng)地。

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二、按要求完成句子練習(xí)?！铩?/p>

1.恐龍的一支經(jīng)過漫長的演化，最終變成了凌空翱翔的鳥兒。（加點(diǎn)詞語可以去掉嗎？為什么？）

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2.以“花園里的花各有特色”為開頭，仿照“小練筆”，用總分結(jié)構(gòu)及對(duì)比列舉的方式寫一段話。

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三、根據(jù)課文內(nèi)容填空。★

課文先介紹了一種科學(xué)假說，即：_____________________________________________________。然后圍繞這一假說介紹了相關(guān)的科學(xué)依據(jù)：" " " " __________________________________________________________________________________________________________。作者還用充滿想象力的語言描繪了"_____________________________________________________的過程。