.If we humans beings continue to waste and destroy natural resources without using _____ energy, such as the energy from the sun, wind and water, our earth will be done for.

A．alternative

B．solar

C．conventional

D．recycled

公共管理的理论吸收了大量其他学科的理论，其中不包括以下哪个？（）

A.公共选择理论

B.政府失灵理论

C.交易成本理论

D.等价交换理论