【題目】根據(jù)所學(xué)知識(shí)，回答下列問題。

（1）西北地區(qū)的地形以____________為主，河流很少，且多為____________，是一個(gè)以____________為主要自然特征的地區(qū)。

（2）西北地區(qū)干旱的原因：________________________________________________。

（3）西北地區(qū)____________自東向西逐漸減少，植被自東向西依次過渡為草原-荒漠草原-荒漠。

【答案】（1）高原、盆地；內(nèi)流河；干旱；（2）深居內(nèi)陸、遠(yuǎn)離海洋，山脈對濕潤氣流的阻擋；（3）降水

【解析】（1）西北地區(qū)的地形以高原、盆地為主，河流很少，且多為內(nèi)流河，是一個(gè)以干旱為主要特征的地區(qū)。

（2）西北地區(qū)由于深居內(nèi)陸、遠(yuǎn)離海洋，山脈對濕潤氣流的阻擋，氣候十分干旱。

（3）西北地區(qū)降水自東向西逐漸減少，植被自東向西依次過渡為草原-荒漠草原-荒漠。

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