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【题目】荒漠化已成为当今全球最为严重的生态环境问题之一。根据联合国环境署推断,目前世界约1/4的陆地、2/3的国家和地区受到荒漠化的威胁。中国是全球荒漠化面积大、分布广、危害严重的国家之一,其中西北地区则是我国风沙危害和荒漠化问题最为突出的地区。回答下列问题。

【1】下列自然特征中,本身就包含着荒漠化潜在威胁的是

A.干旱的气候条件

B.高原、盆地为主的地形

C.人口激增

D.过度放牧

【2】在荒漠化的发生、发展过程中,常常起决定性作用的是

A.草原、荒漠为主的植被 B.人类活动

C.疏松的沙质沉积物 D.气候变异

【答案】

【1】A

【2】B

【解析】

试题分析:

【1】西北地区气候干旱,降水少,因干旱植被覆盖率低,风沙危害大,易产生荒漠化,所以干旱的气候条件本身就有荒漠化的威胁,而CD项为人为因素不是自然特征,故选A。

【2】荒漠化产生有自然原因也有人为原因,而人为原因对荒漠化起决定作用,故选B。

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