下面算式中，乘号可以省略的是（  ）

下列概念的分类标准正确的是

漫画《需求有弹性》告诉我们，在经济生活中    (    )

①价格变动对生活必需品的影响较小
②价格变动对高档耐用品的影响较大
③价格变动对生活必需品的影响较大
④价格变动对高档耐用品的影响较小

--It’s said that no one ______ light a cigarette at a gas station.
--- Yes. Safety always comes the first.

The hospital in Harbin is already _________ of shocking mistreatment, as a 74-year-old man died of heart failure, after 67 days of treatment which cost the family 5.5 million yuan.