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
It will be safer to walk the streets because people will not need to carry large amounts of cash; virtually all financial ______ will be conducted by computer.
A．transactions
B．transmissions
C．transitions
D．transformations
单项选择题
The local government leaders are making every effort to ______ the problem of poverty.
A．abolish
B．tackle
C．remove
D．encounter
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