根据句意及汉语提示完成单词
①There's a____(电脑)on the teacher's desk.
② What can you see in the____(图片)?
③ Is there a____(电视)in Lucy's room?
④There isn't any ____(家具)in the old house.
⑤The old man is ____(九十)years old.
关节是能活动的骨连结,在运动中起支点的作用.如图是关节结构模式图,下列说法正确的是( )
x,y是两个不为0的自然数,如果x× 67 =y÷ 76 ,那么( )。
画出如图所示小球所受重力的示意图.