A:−18
B:1
C:﹣1
D:18
—He, together with Tom, _____ going to visit Shanghai in July. How about you?
—I'm afraid I have to stay at home _______
一质点作匀变速直线运动,第5s末速度为v,第9s末速度为﹣v,则质点在运动过程中( )
(____)A. I have two storybooks.
(____)B. It's a maths book.
(____)C. I lost my schoolbag.
(____)D. It's a fat panda.
(____)E. I have three keys in my schoolbag.