题目内容
（请给出正确答案）
The cost of providing shipping services contain ()
A． fixed costs
B．variable costs
C． raw materials cost
D．insurance costs
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Why were some children offered only fruit and milk for lunch？
A．The school stopped providing school lunch.
B．Their parents failed to pay for school lunch.
C．Some parents preferred fruit and milk for lunch.
D．These children chose to have something different.
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