单项选择题

A person's calorie requirements vary ______ his life.

A．across
B．throughout
C．over
D．within
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单项选择题
He offered to ______ her a hand as the suitcase was too heavy for her to carry.
A．help
B．show
C．lend
D．borrow
单项选择题
The patient's health failed to such an extent that he was put into care.
A．tense
B．rigid
C．intensive
D．tight
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