They would like ____ (eat) birthday cake and candy.
不破坏观察的猪心,可以用手捏的方法来判断心房壁、心房壁的厚薄,其中最厚的是( )
There are _____months in a year. _____ month is December.
光在____ 中是沿直线传播的.光的反射分为____ 和____ 两类.
下列各项,属于生物的是( )