单项选择题

It can be inferred that non-human primates______.

A．are mostly left-handed
B．are mostly right-handed
C．are equally divided between right-handers and left-handers
D．are good at using both hands
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单项选择题
The passage provides information for answering all of the following questions EXCEPT______.
A．Do identical twins have the same handedness
B．Is language conducive to survival
C．Is the "gene-culture coevolution" model reliable
D．Why are some people left-handed
单项选择题
According to the gene-culture coevolution ” model, which of the following would be true at the end of the day
A．All people will be right-handed.
B．All people will he left-handed.
C．There are as many right-handers as left-handers.
D．People will use both hands equally well.
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