题目

阅读理解I'm a strong believer that learning different languages makes you look incredibly good when you're in a foreign country and can understand and speak the language. The list below is 4 apps that will help you learn a foreign language! You can download them for free.Babbel ? Learn LanguagesBabbel is an excellent language tool to help you progress step by step with learning a new language. It helps you learn grammar along the way as you work your way through the tasks and assignments. The downside is that for full access to everything you need to pay a monthly subscription, but this wi如图所示,一只小球在固定的竖直平面内的圆环内侧连续做圆周运动,当它第4次经过最低点时速率为7m/s,第5次经过最低点时速率为5m/s,那么当它第6次经过最低点时速率应该为(在所研究的过程中小球始终没有脱离圆周轨道) [     ]A.一定是3m/sB.一定是1m/sC.一定大于1m/sD.一定小于1m/s
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