【題目】黑河——騰沖線是我國( )

A.地勢第二、三級階梯分界B.人口地理分界線C.亞熱帶與暖溫帶分界 D.內(nèi)流區(qū)與外流區(qū)分界線

【答案】B

【解析】

根據(jù)中華人民共和國成立后，由于人民生活水平的提高和醫(yī)療衛(wèi)生條件的改善，人口死亡率大幅度下降，中國人口快速增長。根據(jù)2010年全國第六次人口普查結(jié)果，中國總?cè)丝跒?/span>13.7億，約占世界人口總數(shù)的1/5，是世界上人口最多的國家，進(jìn)行分析解答。

中國人口地區(qū)分布不均。一般來說，以黑龍江省的黑河云南省的騰沖線為界，東部地區(qū)人口多（稠密），西部地區(qū)人口少（稀疏）；此線以東人口稠密，面積僅占全國總面積的43%，人口卻占全國總?cè)丝诘?/span>94%，此線以西人口稀疏，面積占全國總面積的57%，人口只占總?cè)丝诘?/span>6%；地勢第二、三級階梯分界線為大興安嶺、太行山、巫山、雪峰山；亞熱帶與暖溫帶分界為秦嶺——淮河一線；內(nèi)流區(qū)與外流區(qū)分界線基本與季風(fēng)區(qū)與非季風(fēng)區(qū)的界線吻合。

故選B。

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