急性腹泻病程为 _________ ，迁延性腹泻病程为 _________ ，慢性腹泻病程为 _________ 。
参考答案：<2周2周～2个月>2个月
Evidence came up _______ specific speech sounds are recognized by babies as young as 6 months old.
A．what
B．which
C．whose
D．that
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