题目内容：
What does the sentence "manufacturing is often linked to age and gender" (Line 2, Para．2) mean?
A．People of all ages and both genders have to do manufacturing work． B．People of all ages and both genders have to do the same work．
C．People of different ages and genders are assigned different jobs．
D．People of a particular age and gender are not specialized in the technical knowledge of other groups．
参考答案：
答案解析：