单项选择题

What is the base of selling price

A．the cost of production
B．a percentage of total cost
C．the cost of transportation
D．the cost of storage.
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单项选择题
The Roosevelt example is used to ______.
A．support the traditional view about the U.S.
B．refute the view of the recent "revisionists"
C．refute the Monroe Doctrine
D．support Roosevelt' s foreign policy
单项选择题
In lens design,______.
A．it is completely impossible to preset the best steps along the way
B．it is always very hard to solve any problems
C．one can work out a best solution to problems in each step
D．there are countless steps towards the final goal
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