参与药物代谢Ⅰ相反应的酶系统是
A．肠道菌丛酶系B．肝微粒体酶系C．葡萄糖-6脱氢酶D．α糖苷酶E．非微粒体酶系
参考答案：B
— You shouldn't have talked back to our teacher like that. It was awfully impolite.
— You are right. I _________ crazy at that moment. [ ]
A. could have been
B. can be
C. must have been
D. should have been
简述输精管结扎的禁忌证。
