在一定时间内对生命有机体生活、生长发育、繁殖以及对有机体存活数量有影响的空间条件的总和就是（）

A.生物圈

B.生态因子

C.生物生存环境

D.生境

A client has been diagnosed with type A hepatitis. What special precautions should the nurse take when caring for this client

A．Put on a mask and gown before entering the client's room.

B．Wear gloves and a gown when removing the client's bedpan.

C．Prevent the droplet spread of the organism.

D．Use caution when bringing food to the client.