在□ABCD中,AB=3,AD=5,则□ABCD的周长为( )
A:8
B:10
C:12
D:16
She was so busy ____(look) for her mobile phone that she didn't see a car coming.
如图所示,“神舟七号”载人飞船环绕地球做匀速圆周运动,在大约15小时的时间内环绕地球运动十圈.以下说法正确的是( )