有关淋球菌叙述，错误的是（）

A.G-双球菌

B.分离可用巧克力血琼脂培养基

C.PCR可作为确诊试验

D.抗原性易发生变异

E.常规作血清学试验

A great deal of advanced science and technology has been ______ since China carried out the reform and opening policy.

A．brought down

B．brought in

C．brought out

D．brought up