已知函数f(x)=ax²-(3-a)x+1，g(x)=x，若对于任一实数x，f(x)与g(x)至少有一个为正数，

则实数a的取值范围是

A．［0,3)

B．［3,9)

C．［1,9)

D．［0,9)

The software architecture of a program or computing system is the structure or structures of the system, which comprise software______, the externally ______ properties of those components, and the relationships between them. The architecture is not the operational software. Rather, it is a ______ that enables a so, ware engineer to: analyze the ______ of the design in meeting its stated requirements, consider architectural alternatives at a stage when making design changes is still relatively easy, and reduce the ______ associated with the construction of the software.

A．changeability
B．effectiveness
C．testability
D．functionality