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With less of time to learn the Internet or IOT,there many knowledge to learn,it's quite difficult.The need comes,we now solve it.To drag the answer to aim if it's right or return.It's important to store the position of beginning and end.Judge the result,then deside if return.“Drag If True” is exercise,“Drag With Score” is test.To solve this,the score var from 0 to 100 for the result.To join two points to a line is a question to sort the knowledge.With two arrays,the element can be selected once,Judge,Join,Tips… to be continue 
