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市场出现不完全竞争,是因为()。

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19 Some of the trials were probably stopped early for commercial reasons.
A Right
B Wrong
C Not mentioned

42 WhichstatementabouttheepidemicisNOTtrue?
A Itoccurseveryfourthyear.
B ItstartsonMarch15.
C Itisknownas"MarchMadness".
D ItlaststhroughthebeginningofApril.

(2009年真题)关于各类规划的编制和期限,下列说法正确的是()。

下列哪一项为教育的发展提供了基础性条件()

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