资源的稀缺性是指
A.不可再生资源越用越少
B.世界上的资源终将被消耗完
C.世界上大多数人生活在贫困中
D.资源相对于人们的需要总是不足的
正确答案是D
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Humans, unlike many other animals, are omnivores. We require both vegetable matter and meat to be fully healthy (although some humans manage to live reasonably healthily whilst consuming no animal products at all, finding their protein mainly in n
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