environmental-friendly or environment-friendly?名词还是形容词啊?

environmental environmental environmental We can have more ____ buildings and houses .A.environmental friend B.environmental friendlyC.environmentally friend D.environmentally friendly为什么选D不选A,请详解, environmental aerosol environmental是什么意思 an environmental problem in environmental friendly material是什么意思 high environmental 怎么翻译 Environmental workers怎么读 environmental damage是什么意思 ENVIRONMENTAL意思是什么? the goldman environmental foundation environmental matrices是什么意思 Environmental Science的意思! environmental-alarm是什么意思 environmental causes是什么意思? environmental protact bureau是什么意思