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　　A manufacturing default means the hair produced is so small that it appears invisible to the naked eye，giving the classic bald spot or receding hairline(发际线)．The US team told the Journal of Clinical Investigation the fault lies with the stem cells that make new hair.It may be possible to“cure”male baldness by restoring the normal function of these cells，the experts hope.Ultimately，they hope to be able to develop a cream that could be applied to the scalp(头皮)to help the stem cells grow normal hair.

　　The underlined word“receding”in the paragraph most probably means________.

　　A．gradually moving backwards

　　B．getting thicker and thicker

　　C．becoming difficult to see

　　D．gradually disappearing

　　答案　A　[词义猜测题。画线词前的单词or前后的bald spot和receding hairline意义相近，可见此处指发际线逐渐后移，也就是秃顶。A项与此意义最为相近。]