题目

将一根铁丝剪去一段后，剩余部分的密度                     ，将氧气瓶中的氧气用去一部分，剩余氧气的密度                     。（填：不变、变小、交大） 答案：不变              变小 When asked ________ they needed most, the kids said they wanted to feel important and loved. A．what             B．why              C．whom            D．which