图为伽利略研究自由落体运动实验的示意图,让小球由倾角为θ的光滑斜面滑下,然后在不同的θ角条件下进行多次实验,最后推理出自由落体运动是一种匀加速直线运动。分析该实验可知,小球对斜面的压力、小球运动的加速度和重力加速度与各自最大值的比值y随θ变化的图像分别对应题4图2中的
If you want to visit the Palace Museum, I tickets for you tomorrow.( )
A.will bookB.booked
C.have bookedD.was booking
Our school life a lot since 2017. We have more activities now.( )
A.changesB.changed
C.will changeD.has changed
﹣ Tom, what's your dad doing?
﹣ He my bike.( )
A.repairsB.will repair
C.has repairedD.is repairing
Sam with his friends every weekend.( )
A.skatesB.is skating
C.has skatedD.was skating
Julie takes good care of the family dog. She is than her brother.( )
A.patientB.more patient
C.most patientD.the most patient