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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More than once ______us by now to adhere to the rules and disciplines of our university.
[A] has our teacher told
[B] our teacher has told us
[C] did our teacher tell
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Cancer is second only ______heart disease as a cause of death in the world.
[A] to
[B] with
[C] from
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