Geography is the study of the countries of the world and of such things the land, seas, climate, towns, and population.
A. as
B. that
C. which
D. what
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(答案→)A. as
B. that
C. which
D. what
解析：句意:地理学是对世界上的国家的土地、海洋、气候、城镇及人口等的研究。因为空格后不是句子，所以不需要连词，such …as诸如……之类，根据句意故选A。