Each of us is looking forward _________ a good result. Let's do it more carefully.
A:to get
B:for getting
C:to getting
在△ABC中,点D为BC的中点,BD=3,AD=4,AB=5,则AC=____。
有些同学撒谎被揭穿后往往表现为脸红、心跳加速,这主要是由于人体中什么激素瞬间分泌量大增引起的? ( )