I have no one ____ me, for I can deal with it all by myself.

A．to help

B．to have helped

C．help

D．helped

人类要生存，就得与自然环境打交道。和自然环境打交道就应该首先学会遵守一定的规则，这些规则是[     ]

①节约资源

②保护自然

③保护环境

④制定法律法规

A、①②③

B、②③④

C、①②④

D、①③④