March 5th is the official “Learning from Lei Feng Day” when people are ______to learn from Lei Feng, a cultural image symbolizing selflessness and contribution.

A．called on

B．called up

C．called in

D．called off

铜绿假单胞菌培养特性为（）

A.专性需氧

B.专性厌氧

C.兼性厌氧

D.微需氧

E.需5%～10%CO₂