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
The bird flew upward and dropped the shellfish onto the rock to ______it open.
A．break
B．press
C．cut
D．shake
单项选择题
A survey was carried out on the death rate of new-born babies in that region, ______ were surprising.
A．as results
B．which results.
C．the results of it
D．the results of which
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