【題目】讀沿某緯線我國地勢剖面圖,回答問題。(5分)

(1)據(jù)圖可以推出我國地勢的總體特征,這種地勢特征對我國河流有何影響?

______________________________________________(2分)

(2)我國地勢各階梯上分布著不同的地形區(qū)。如圖所示,有世界屋脊之稱的是___________________,位于地勢第三階梯之上的地形區(qū)是 _______________。

(3)溝壑縱橫描述的是我國__________高原的地表特征。

【答案】

(1)使大河滾滾東流,溝通了東西交通,方便了沿海和內(nèi)地的聯(lián)系

(2)青藏高原 華北平原

(3)黃土高原

【解析】

試題分析:

(1)我國地勢的總體特征是西高東低、呈三級階梯狀分布。這種地勢特征有利于海洋上的濕潤氣流深入內(nèi)陸形成降水;許多大河滾滾東流溝通了東西交通,方便了沿海和內(nèi)陸的聯(lián)系;階梯交界處水能資源豐富。

(2)我國地勢各級階梯上分布著不同的地形區(qū)。第一級階梯包括青藏高原和柴達(dá)木盆地,地形以高原為主;第二級階梯包括塔里木盆地、準(zhǔn)噶爾盆地、四川盆地、內(nèi)蒙古高原、黃土高原、云貴高原,地形以高原、盆地為主;第三階梯主要包括東北平原、華北平原、長江中下游平原,以及遼東丘陵、山東丘陵和江南丘陵,地形以平原和丘陵為主。據(jù)圖可知:有“世界屋脊”之稱的是青藏高原,位于地勢第三級階梯上的地形區(qū)是華北平原。

(3)黃土高原地區(qū)由于土質(zhì)疏松、降水強(qiáng)度大且多暴雨,再加上植被破壞嚴(yán)重,赤水土流失嚴(yán)重,對地表的沖刷力強(qiáng),因此形成了“溝壑縱橫”的地表特征,治理該生態(tài)問題的措施主要是植樹種草。

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