微生物有哪5大共性?试分析讨论5大共性对人类的利弊。

A. To make an appointment.
B. To ask about the man's order.
C. To confirm the delivery.
D. To complain about the service.

A. They are user-friendly.
B. They are newly developed.
C. They are popular abroad.
D. They are of high quality.