单项选择题

According to the passage, all of the following may affect a person's handedness EXCEPT______.

A．personality
B．genes
C．culture
D．random events
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单项选择题
With which of the following subjects is the passage mainly concerned
A．Types of mass transportation.
B．Instability of urban life.
C．How supply and demand determine land use.
D．The effects of mass transportation on urban expansion.
单项选择题
According to the passage, what was one disadvantage of residential expansion
A．it was expensive.
B．It happened too slowly.
C．It was unplanned.
D．It created a demand for public transportation.
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