同一介质中,光是沿着直线传播的,通常称为____。光可以在____、空气、水、____等中传播。
—There is an MP5 on the desk,whose is this? —It can be my ____,she bought one yesterday.
(2014·台州)如图为某人饭后四小时内血糖含量的变化曲线。下列叙述正确的是( )