下列化学用语表达正确的是（　　）

A．氯化钠的电子式：

B．NH₃的结构式：

C．S^2-的结构示意图：

D．乙烯的结构简式：CH₂CH₂

The opening province which ______ thirteen counties and three coastal cities will quicken its paces of economic development.

A．consists of

B．makes up of

C．is included

D．is contained