题目

This  dictionary  tells  you  about English words and how to use them in reading, writing and speaking English. It not only gives the meaning of words, it can also help you with spelling, word building, grammar and pronunciation.  To use your dictionary correctly, you will find two spellings for this word. “Colour” is used in British English, while “color” is used in American English.  When there are differences between British and American spelling, the dictionary shows it with the word “BrE” for British English and “AmE” for American English.   The dictionary 坐标平面上的点P（2，﹣1）向上平移2个单位，再向左平移1个单位后，点P的坐标变为（　　）A.（2，1）B.（﹣2，1）C.（1，1）D.（4，﹣2）