题目1单选题
<img src="http://edu-image.nosdn.127.net/817F08FB94DE0370FA8A9353164DFF67.png?imageView&thumbnail=520x520&quality=100">A. (-<img src="/ananas/latex/p/151">,3)<img src="/ananas/latex/p/847">(5,+<img src="/ananas/latex/p/151">)B. (-<img src="http://mooc1.sce.ncu.edu.cn/ananas/latex/p/151">,-5)<img src="http://mooc1.sce.ncu.edu.cn/ananas/latex/p/847">(3,5)C. (-<img src="http://mooc1.sce.ncu.edu.cn/ananas/latex/p/151">,-10)<img src="http://mooc1.sce.ncu.edu.cn/ananas/latex/p/847">(3,5)D. (-<img src="/ananas/latex/p/151">,+<img src="/ananas/latex/p/151">)