His letter ______ the impression that he was indifferent, which he hadn’t meant to but really made him upset.

A．exposed

B．delivered

C．displayed

D．conveyed

关键信息基础设施的运营者采购网络产品和服务，可能影响国家安全的，应当通过国家网信部门会同国务院有关部门组织的（）。

A.国家采购审查

B.国家网信安全审查

C.国家网络审查

D.国家安全审查