When the children were told that they could go camping on Saturday,they could         to tell their best friends.

A．never wait

B．nearly wait

C．hardly wait

D．always wait

下列属于反射的是

A．葵花向太阳

B．石灰水遇二氧化碳变浑浊

C．草履虫游向食物

D．学生听到铃声走进教室