It's really _______ to be alone at home. I like staying with my friends.
A:relaxing
B:boring
C:interesting
D:interested
某物体做匀速直线运动,由速度公式V=st可知,物体的( )
dream(复数)____
关于机械能守恒,下列说法正确的是( )
夏天的雨后,常有一些蚯蚓爬出地面,这是因为( )