如图所示,是A、B两质点从同一地点运动的s﹣t图象,则下列说法正确的是( )
A:B质点最初4 s做加速运动,后4秒做减速运动
B:B质点一直沿着同一方向运动
C:A质点以20 m/s的速度匀速运动
D:A,B两质点在4 s末相遇
too, lost, red, first, English, eraser, find, number, must, last
Hi, I'm Jenny Brown. Jenny is my ____ name. Brown is my ____ name. I'm an ____ girl. This morning I ____ my pencil box in the library. I ____ find it. My pencil box is ____. In it, you can see an ____ and a set of keys. If you ____ my pencil box, please call me. My telephone ____ is 765-0652. You can e-mail me, ____. My e-mail address(地址) is jenny 1256@ 126.com. Thanks!
When do you____ ____ ?
下列有关天体和天体系统的说法正确的是