题目内容
（请给出正确答案）
[多选题]
下列几组商品中，需求价格弹性为负的有()。
A.公共汽车和出租车
B.羽毛球和羽毛球拍
C.苹果和梨子
D.小汽车和汽油
E.牙膏和牙刷
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A. to study
B. studying
C. study
D. studied
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