单项选择题

A．Nobody.
B．The two girls.
C．The bus driver.
D．Paul.
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单项选择题
According to the passage it is commonly believed that brain differences are caused by ________factors.
A．biological
B．psychological
C．physical
D．social
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A．Nine out of ten cats have a better chance of survival.B．What is the significance of the seventh floorC．What’’s the cats’’ terminal speedD．Most cats can survive when falling.
A．Nine out of ten cats have a better chance of survival.
B．What is the significance of the seventh floor
C．What’’s the cats’’ terminal speed
D．Most cats can survive when falling.
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