.If we humans beings continue to waste and destroy natural resources without using energy

问题补充：

.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

答案：

(答案→)A. alternative

B. solar

C. conventional

D. recycled

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