单项选择题

Cancer is second only ______ heart disease as a cause of death in the world.

A．to
B．with
C．from
D．of
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单项选择题
When a psychologist does a general experiment about the human mind, he selects people ______ and asks them questions.
A．at random
B．at will
C．at length
D．in essence
单项选择题
In the bank he changed his pounds for the ______ amount of dollars.
A．identical
B．similar
C．equivalent
D．same
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