肠梗阻的主要病理生理变化是（）
A.肠膨胀和肠坏死
B.体液丧失
C.电解质紊乱
D.感染和毒素吸收
E.以上都是
参考答案：E
显微镜中______是实现第一级放大的镜头；______是实现第二级放大的镜头．
—Does anybody want an extra ticket to go to the movies?
—Whom would you rather _______ with you, Li Hua or me?
A．to go
B．have go.
C．have to go
D．have gone
