下列属于消费者与生产者之间的关系的是[ ]
A．青蛙捕食蝗虫
B．兔子啃吃松蘑
C．山羊吃树叶
D．人类吃黑木耳
答案：C
当S≤1.64N的区域属于超声波的（）。
While teaching students, teachers should take into consideration ______ students develop at different rates.
A．the fact that
B．because
C．as long as
D．in spite of
