What were you doing when you____ ( hear) the news?
— What kind of animal has a long nose?
— _________. ( )
物质的性质决定物质的用途,你认为下列物质的用途与其物理性质有关的是( )
读图“我国土地利用类型构成图”,完成以下问题。
右图是科学家新研发的制备单克隆抗体的过程,相关叙述错误的是( )