曲度不可能变化的是
A.脊柱颈面B.脊柱胸曲C.脊柱腰曲D.脊柱骶曲E.脊柱侧曲
参考答案:D
Quite a few teenagers are used to depending on their parents, so they aren't able to look after ______. [ ]
A. themselves
B. they
C. them
D. themself
专利权