黄曲霉毒素中，毒性最大，致癌性最强的是
A．黄曲霉毒素M1B．黄曲霉毒素B1C．黄曲霉毒素G1D．黄曲霉毒素B2E．黄曲霉毒素Pl
参考答案：B
肝硬化时，肝脏激素灭活功能下降表现为（）。
A.肝性脑病
B.食管胃底静脉曲张
C.白蛋白下降
D.女性闭经
E.黄疸
The elderly need special care in winter, as they are _____ to the sudden change of weather. [ ]
A. sensitive
B. sensible
C. flexible
D. positive
