语法与词汇 9.The form and physiology of leaves vary according to the______in which they develop: for example, leaves display a wide range of adaptations to different degrees of light and moisture.
【正确答案】 D
【答案解析】句意：树叶的形状和牛理机能随着外界环境的改变而改变。例如：树叶会随着光线和水分的不同而做出多种调整。environment环境，外界。relationship关系；关联。speies物种；种类。pallem模式；图案；样品。