听力原文:M: Good morning, Mrs. Wells. It's a long time since I visited you last time. W: Yes, it must be three or four years. I haven't visited you since I called on you about my will. You helped me a lot, remember? Q: Who is the man? (16)
A.
Mrs. Wells' neighbor.
B.
Mrs. Wells' classmate.
C.
Mrs. Wells' lawyer.
D.
Mrs. Wells' doctor.
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【单选题】已知数据x 1 、x 2 、…x n 的平均数,则一组数据x 1 +7,x 2 +7,…x n +7的平均数是( )