Such an inspiring speech ________ at the graduation ceremony that every one of us was deeply moved and strongly encouraged.

A．did he make

B．he made

C．had he made

D．he had made

根据组织对缺氧耐受时伺的长短，下列哪项是正确的：

A．骨胳肌＜纤维细胞＜肝细胞

B．脑＜心肌＜骨骼肌

C．心肌＜脑＜骨骼肌

D．纤维细胞＜骨骼肌＜骨髓肌＜心肌

E．骨骼肌＜心肌＜脑