皮皮学，免费搜题
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搜题
【单选题】
自然学科中唯一上升为理论层次的学科是:A.
医学
B.
建筑学
C.
经典力学
D.
数学
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皮皮学刷刷变学霸
举一反三
【单选题】It is difficult to describe the countryside during the period under consideration, partly because the inhabitants______
A.
often did not fit the conformity of their society
B.
sometimes changed their system of life
C.
move around too much for us to study properly
D.
left no documents