As long as we persist in spreading scientific knowledge among the masses，all the strange beliefs

are __________ to go out of our life.[ ]

A．necessary  

B．important

C．difficult  

D．bound

我国发展低碳经济的对策主要有技术创新和（）

A.产业结构调整 

B.低碳共同体 

C.国际合作 

D.制度创新