对于正常商品来说,在其他条件不变的情况下,商品价格与需求量之间存在着( )的变动关系。

The first paragraph points out that one of the advantages of a family with both parents is（）．

A．husband and wife can share housework
B．two adults are always better than one
C．the fundamental importance of mothers can be fully recognized
D．husband and wife can compensate for each other’s shortcomings

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现有两枚质地均匀的正方体骰子，每枚骰子的六个面上都分别标有数字1、2、3、4、5、6.同时投掷这两枚骰子，以朝上一面所标的数字为掷得的结果，那么所得结果之和为9的概率是（）

A.1/3
B.1/6
C.1/9
D.1/12

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