协调最适温是指（）的温度。
A．生长最快又健壮
B．生长最快，但不太健壮
C．生长次快，但很健壮
D．生长很慢，但很健壮
参考答案：C
I always persuade Mary to have both feet on the____as she wants to marry a millionaire and accomplish her goals in an easy way.
A．ground
B．earth
C．location
D．place
简述集体行为的内涵及其主要类型。
