A "Natural Resource" is “自然资源”是Single choice

A

a. 一个。resources derived from ecosystems that are of use to humans源自对人类有用的生态系统的资源

B

b. organic and nonorganic material of use to all living things用于所有生物的有机和非有机材料

C

c. A resource that is natural 天然资源

D

d. materials and compounds found in the environment that people can use环境中发现的人们可以使用的材料和化合物

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