单项选择题

According to the passage, which of the following human features evolved first

A．The development of human brains.
B．Upright posture of two-leg walking.
C．The change of the skeletons.
D．The use of language.
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单项选择题
Judging from the context, the word forage (Line 6, Paragraph 6) most probably means ______.
A．watch out in case some danger occurs
B．look after sb, especially the young baby
C．find out sth. perilous
D．wander in search of food or provisions
单项选择题
Human babies are born in immature, helpless states, owing to ______.
A．the early birth of human fetuses
B．the big brains of the fetus
C．the constricted birth canals of the mother
D．both big brains and constricted birth canals
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