Rose received a letter full of love from her parents on her ______ birthday.
A:sixteen
B:sixteen's
C:sixteenth
D:sixteenths
—People now can know what is happening in the world quickly. —You're right.With the help of computers,news can ___every corner of the world.
贝多芬听到断断续续的钢琴声从路旁一所低矮的房屋里传出来。(缩句)
甲、乙两质点同时、同地点向同一方向作直线运动,它们的v﹣t图象如图所示,则( )