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【单选题】
下列有关酸雨的说法正确的是A.
酸雨就是指pH<7的雨水
B.
酸雨是因为雨水中含有CO 2
C.
工业上大量燃烧含硫燃料和以含硫矿石为原料冶炼金属产生的SO 2 是产生硫酸型酸雨的主要原因
D.
酸雨没有危害，所以不必担心，也不必想办法治理
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【单选题】Which one is wrong about classification and regression?
A.
Regression analysis is a statistical methodology that is most often used for numeric prediction.
B.
We can construct classification models (functions) without some training examples.
C.
Classification predicts categorical (discrete, unordered) labels.
D.
R egression models predict continuous-valued functions.
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