问题
单项选择题
By age 7 months, an infant most likely will develop which of the following motor skill
A．Walk with one hand held.
B．Eat successfully with a spoon.
C．Stand while holding onto furniture.
D．Sit alone using the hands for support.
答案
参考答案：D
解析：By age 6 months, an infant can sit alone, leaning forward on the hands for support. The ability to sit follows progressive head control and straightening of the back.