皮皮学，免费搜题
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【单选题】
现在人们普遍认识到环境问题不止是局部或者是一个国家的问题，需要全人类的共同努力，那么下列哪项不属于全球性环境问题？（）A.
酸雨
B.
气候变暖
C.
生物锐减
D.
噪声污染
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
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【简答题】英译中 If, on the other hand, producing more of a commodity results in reducing its cost, this will tend to increase the supply offered by seller-producers, which in turn will lower the price and permit ...
【单选题】When the opportunity cost of producing more of a good is increasing, the marginal cost of producing more of the good is
A.
decreasing.
B.
constant.
C.
increasing.
D.
More information is needed to answer the question.