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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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
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单项选择题
This evolution of human brains was not without its difficulties for mothers, because ______.
A.human brains started to grow larger
B.our ancestors walked upright on two legs
C.it altered our ancestors' skeletons
D.it makes the passage of big-brained infants difficult
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