【題目】不同類(lèi)型的區(qū)域劃分，有不同的地理界線。下列說(shuō)法正確的是 （ ）

A. 昆侖山脈是我國(guó)地勢(shì)第二、三級(jí)階梯的分界線

B. 秦嶺一淮河是溫帶季風(fēng)氣候和亞熱帶季風(fēng)氣候的分界線

C. 黑河一騰沖線以西人口稠密，以東人口稀疏

D. 400毫米等降水量線是我國(guó)濕潤(rùn)區(qū)和半濕潤(rùn)區(qū)的分界線

【答案】B

【解析】

試題

在學(xué)習(xí)地理的過(guò)程中，地理區(qū)域和地理界線是非常重要的。地理區(qū)域體現(xiàn)了區(qū)域內(nèi)部的地理相似性，地理界線反映出區(qū)域之間的地理差異性。我國(guó)第二階梯和第三階梯的分界山脈是大興安嶺、太行山、巫山、雪峰山一線；秦嶺、淮河一線是我國(guó)東部地區(qū)重要的地理界線，它是我國(guó)一月份0℃等溫線通過(guò)的地方，800mm等降水線通過(guò)的地方，溫度帶中，暖溫帶與亞熱帶分界線，干濕地區(qū)中，濕潤(rùn)區(qū)與半濕潤(rùn)區(qū)分界線；我國(guó)黑河-騰沖線以東人口密集，以西人口稀少；800mm年等降水量線（秦嶺--淮河一線）是我國(guó)旱地與水田的分界線，故本題選B。

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