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
The purpose of the author in wring this passage is ______.
A．to celebrate Mother's Day
B．to commend the role of the female in the history of human evolution
C．to have a general review of human evolution
D．in honor of mothers all over the world
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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