Our school forbid __________, that is to say, we are not allowed __________at school.

A．to smoke; to smoke

B．smoking; smoking

C．smoking; to smoke

D．to smoke; smoking

有一内径为700mm，长为120km的天然气管道。当天然气压力为3.04MPa，温度为278 K时，天然气的压缩因子为0.94，则管道中的天然气在标准状态下的体积约为（）万m³。

A．133.2

B．144.7

C．150.8

D．155.6