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
下述上颌第一双尖牙的双根率哪个正确
A．80%
B．60%
C．50%
D．95%
E．87%
"I ______ poetry as the food of the love," said Darcy.
A．have been used to considering
B．have used to consider
C．use to consider
D．used to considering
