—Where is her notebook?
—Look! It's _____ the floor.
A. on
B. in
C. at
D. by
答案:A
B.匀变速直线运动
C.匀变速曲线运动
D.非匀变速曲线运动
“广告”一词源于()
A.英文
B.意大利文
C.拉丁文