The old man asked the children to _____ to each other near the campfire so that he could start telling his story at once.

A．take up

B．stay up

C．close up

D．turn up

小儿"生理性贫血"多见于（）。

A.出生后2～3个月

B.出生后4～5个月

C.出生后6～8个月

D.出生后8～10个月

E.出生后10～12个月