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
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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
单项选择题
According to American federal government, residents of Hawaii have the longest life ______: 77.2 years.
A．rank
B．scale
C．span
D．scope
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