单项选择题

Whether you live to eat or eat to live, food is a major ________ in every family's budget.

A．nutrition
B．expenditure
C．routine
D．provision
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单项选择题
There is supposed to be a safety ________ which makes it impossible for trains to collide.
A．appliance
B．accessory
C．machine
D．mechanism
单项选择题
Throughout the year of 1939, there was a ________ rising rate of inflation in the United States. It reached to 10%.
A．firmly
B．sharply
C．constantly
D．roughly
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