A:遗传性
B:适应性
C:应激性
D:变异性
观察如图,量筒中液体的体积读数是( )
鲸是哺乳动物,但是它的体型却像鱼,四肢变为鳍状,这说明生物能____环境;茂密的森林中,空气远比喧闹的城市清洁、新鲜、湿润,这说明生物的生活能____环境.
First-class players of football must have excellent ball control, but it is not just _____ they do with their feet _____ counts.