负责骨基质形成和钙化的细胞为()。
A.成骨细胞
B.前成骨细胞
C.破骨细胞
D.骨细胞
E.骨衬里细胞
参考答案:A
________ anything like this style of architecture before, we thought we were looking at giant sculptures, not buildings.
A.We had never seen
B.Never having seen
C.Never being seen
D.Never had we seen
(1)____________,而神明自得,圣心备焉。(荀子《劝学》)
(2)剑阁峥嵘而崔嵬, ____________, ____________。(李白《蜀道难》)
(3)____________,百年多病独登台。(杜甫《登高》)
(4)彼童子之师,授之书而习其句读者,非吾所谓____________。(韩愈《师说》)
(5)使天下之人,____________,独夫之心,日益骄固。(杜牧《阿房宫赋》)
(6)此情可待成追忆,____________。(李商隐《锦瑟》)
(7)吾日三省吾身:为人谋而不忠乎?____________?____________? (《论语·学而》)