俗语虽有“三翻、六坐、八爬”之说,但婴儿之间也会有相差达两三个月之久的,而有些婴儿甚至根本就没有爬过就直接“直立行走”了,这表明婴儿发展的
A.连续性
B.阶段性
C.持久性
D.个体差异性
正确答案是D
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