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
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
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