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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单项选择题
Much ______ I love him, I can't forgive his action.
[A] that
[B] like
[C] as
[D] of
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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