人体有多少块肌肉？多少骨骼？
参考答案：
640；206。
The last thirty years _____ the greatest number of laws stopping our rights and progress,until today we
have reached a stage ____ we have almost no rights at all.[ ]
A.saw;which
B.have seen;that
C.saw;where
D.have seen;where
操纵自变量有什么要求？
