We’re conducting a nationwide survey of people’s reading habits. Would you have five minutes ________ a few questions?         

A．answering

B．to answer

C．to have answered

D．having answered

下列哪一种食物中毒以神经系统症状为主要临床表现，且病死率较高（）。

A.沙门氏菌食物中毒

B.嗜盐菌食物中毒

C.变形杆菌食物中毒

D.葡萄球菌食物中毒

E.肉毒杆菌食物中毒