When the woman found her borrowed valuable necklace (项链) ______, she felt______ the world was at an end.

A．was missing; unless

B．was lost; as if

C．was missed; whether

D．was gone; as if

如果某商品富有需求的价格弹性，则该商品价格上升（）。

A.销售收益增加

B.销售收益不变

C.销售收益下降

D.销售收益可能上升也可能下降