如图示，质点从N点沿半径为R的两个半圆形轨道运动到P点，质点的路程和位移大小分别为（   ）

根据材料内容，选择正确答案。

C

    Ted, my little brother, is in Grade One. Last Friday he came back from school with a letter. The letter was from his teacher. “I got a red flower today. Could you please sign this note?” he said to mum. The note showed that he had been talking in class.

    Ted hardly gets top scores in his school work. The best he gets is “OK”, but he often gets “You can do better than this.” Mum knows what it means. She tells me “You can do better than this” means “Extremely bad” in China.

    In the USA, teachers never say anything too bad about their students, even if the students are making trouble in class or not working hard enough. The worst they might say is “Please be nicer tomorrow”. Many parents are satisfied with a B-grade for each subject.

    But things in Chinese schools are quite different. Parents have high expectations for their children. I sometimes felt that my second-grade cousin spend more time on homework than I did when I was 6^th grade in the US! Yet his parents and teachers didn't think he worked hard enough.

    Is it too strict in China? Or is it not strict enough in the USA? Maybe both are true.

“蒜你狠”“豆你玩”“姜你军”“油你涨”“苹什么”“药你苦”“煤超疯”“盐王爷”等这些在网络上热议的词汇形象地反映了人们在日常生活中遭遇的困惑，为此我们可以采取的措施有①加强经济体制中的法制建设，严厉打击市场投机行为②坚持将市场调节和国家干预相结合③大力发展社会生产力，增加产品的市场供给④进一步改革和完善社会主义市场经济

若$xy=0$，则点$P\left(x,y\right)$一定在（        ）。