A: 关节的变化
B: 关节的牵拉
C: 骨骼肌的牵拉
D: 躯体位置的变化
⑴ ____
⑵ ____
⑶ ____
⑷ ____
⑸ ____
A. The car is on the box.
B. Look, the bus is in my bag.
C. —Mom, where is my ball?
—Look, It's under the chair.
D. —Excuse me, Amy. Can I use your pencil?
—No problem.
E. Where are my pants?
心脏是人体血液流动的动力器官,它位于( )
下列说法中不正确的是( )