—I have been told that our visit to the Summer Palace will be cancelled because a very important foreign delegation will be there.

—Oh no! _______.

A．I hope so

B．I was looking forward to it

C．I’m afraid not

D．It doesn’t matter

生产过程中产生的生物因素是（）

A.铅、刺激性气体、苯、汞

B.运动器官紧张

C.炭疽杆菌、布氏杆菌

D.视觉紧张

E.噪声、电离辐射