【題目】 “不望祁連山頂雪，錯把甘州當(dāng)江南�！焙游髯呃鹊膹堃丛�(jīng)稻花飄香，出產(chǎn)稻米。新中國成立初期河西走廊是我國的十大商品糧基地之一�，F(xiàn)在仍為我省重要的糧食產(chǎn)區(qū)。據(jù)此完成下面小題。

【1】河西走廊的灌溉水源主要來源于（ ）

A.大氣降水B.地下水C.冰雪融水D.湖泊水

【2】河西走廊發(fā)展種植業(yè)最具特色的優(yōu)勢條件是（ ）

A.光熱充足B.水源充足C.地勢平坦D.勞動力豐富

【3】河西走廊現(xiàn)今已淡出國家級商品糧基地的名錄。原因可能是（ ）

A.風(fēng)力過強B.耕地不足C.地形崎嶇D.水源缺乏

【答案】

【1】C

【2】A

【3】D

【解析】

【1】

河西走廊是指甘肅南部的祁連山山麓，這里因為有祁連山的冰雪融水提供灌溉水源，成為了西北地區(qū)重要的糧食產(chǎn)區(qū)，故選C。

【2】

河西走廊是我國西北地區(qū)重要的農(nóng)業(yè)區(qū)，這里發(fā)展種植業(yè)最具特色的優(yōu)勢條件是光熱充足，因為該地區(qū)屬于溫帶大陸性氣候，全年降水稀少，光熱充足，故選A。

【3】

隨著土地荒漠化的加劇，全球變暖導(dǎo)致該地區(qū)氣候反常，使該地區(qū)的水源越來越缺乏，河西走廊逐漸淡出國家級商品糧基地的名錄，故選D。

本題考查河西走廊有關(guān)知識。

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