单项选择题

The main point of this passage is ______.

A．evolution of speech
B．darwin's law of natural selection
C．progress of human brains
D．evolution of human intelligence
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单项选择题
What kind of people had the advantages among ancient ancestors
A．Those who could weave with threads.
B．Those who possessed the highest level of language.
C．Those who were creative in tool-making.
D．Those who could play magic.
单项选择题
When you are frustrated with something, the author advises you to ______.
A．get relaxed and wait
B．work much harder
C．ask someone else to help you
D．give in the problem
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