人体的运动系统由那几部分组成？人体有多少块骨头？多少块肌肉？
参考答案：
人体的运动系统由骨骼、关节和肌肉组成，人体有206块骨头、600块肌肉
The bus hit against a tree in the fog and __________to the deep valley, with ten passengers killed and twenty wounded.
A．down did it roll
B．down rolled it
C．down it rolled
D．it down rolled
首先提出李白父亲本为西域胡人，至蜀地才改姓李的学者是()
A．詹锳
B．陈寅恪
C．郭沫若
D．鲁迅
