如图所示，开关闭合后电流表示数与闭合前相比
A.不变
B.减小
C.增大
D.无法确定
答案：C
B．白光通过三棱镜产生的彩色光带是光的干涉现象
C．发射电磁波时需要对电磁波信号进行调制
D．在不同的惯性系中，一切物理规律是相同的
Man: Look, the view is fantastic．Could you take a picture of me with the lake in the background Woman: I'm afraid I just ran out of film. Question: What do we learn from the conversation
A．The woman is watching an exciting film with the man.
B．The woman can't take a photo of the man.
C．The woman is running toward the lake.
D．The woman is filming the lake.
