Question

The number of red-crowned cranes is getting ___________.

A．small and small	B．little and little
C．smaller and smaller	D．less and less

Answer 1

C

考查比较级的用法。句意“丹顶鹤的数量正在变得越来越少。”“比较级+and+比较级”表示“越来越......”。less修饰不可数名词。small和big用来指数量的多少。故选C。