【題目】課外閱讀
植樹還要愛樹
植樹的好處可多啦。樹長大了,樹葉不僅可以給人遮陰,可以使空氣清新,還可以減弱噪音。樹干可以用來蓋房子,做家具和造紙。在街道、宅旁植樹,還可以潔凈空氣和美化環(huán)境。
但是,植樹還要愛樹,才能保證種一棵活一棵。
剛種下去的小樹苗特別需要水,如果很長時(shí)間不下雨,或者小樹周圍的土地非常干,那么每天都要澆水,一直澆到幼苗成活。樹根是樹木吸收水分和營養(yǎng)的器官。人們常說,根深才能葉茂,就是這個道理。新栽的小樹根扎得不深,如果經(jīng)常搖晃,新長出來的細(xì)根很容易折斷,樹根吸收不到水分,樹就會枯死。樹怕剝皮,就是因?yàn)闃淦だ镉性S多輸送營養(yǎng)的小管,如果把樹皮剝了,樹得不到養(yǎng)料就會死的。樹皮破了,細(xì)菌侵入樹身,樹也會得病。另外,新栽的小樹比較“嬌氣”,不能折斷它的枝干,如果把主干弄斷了,樹就會生出許多側(cè)枝。這樣的樹既不好看,也不能成材。
1.課文一共有( )個自然段。
2.第三自然段講了“一要”“三不要”請答一答。
“一要”是:____________________________________________________
“三不要”是:__________________________________________________
________________________________________________________________
3.寫出樹木對人類的用途。
______________________________________________________________
______________________________________________________________
【答案】1.六
2.“一要”是特別需要水,每天都要澆水,一直澆到幼苗成活。“三不要”不要經(jīng)常搖晃,不要把樹皮剝了或把樹皮弄破了,不要折斷它的枝干。
3.凈化空氣,提供原料,涵養(yǎng)水源,防風(fēng)固沙,調(diào)節(jié)溫度,制造氧氣,提供木材。
【解析】1. 每一個自然段前面都會空兩個格 即兩個字的位置。不管這段話有幾句話。只要前面空兩個格就是一個自然段,所以說看這篇文章幾個自然段,就看有幾個空兩個格的段落就可以了。
2. 根據(jù)第三自然段內(nèi)容,知道小樹需要什么,注意什么,總結(jié)出來即可。
3. 根據(jù)文章中第一段總結(jié),或者根據(jù)自己知道的寫出,意思對即可。
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