The changing demographics will not only affect selection ratios. They will also make it increasingly important for organisations wishing to maintain in their competitive edge to be more responsive and accommodating to the changing needs of their workforce if they are to retain and develop their human resources. More flexible working hours, the opportunity of work from home of job share, the provision of childcare facilities etc., will play a major role in attracting and retaining staff in the future.
答案：Heading: The effect of changing demographics on organisations（段落第二句为段落主题句，而第一句起承上作用。注意：在not only…also结构中，not only部分承上，also部分启下，为段落主题所在）
例二
原文：
While the Inuit may not actually starve if hunting and trapping are curtailed by climate change, there has certainly been an impact on people’s health. Obesity, heart disease and diabetes are beginning to appear in a people for whom these have never before been problems. There has been a crisis of identity as the traditional skills of hunting, trapping and preparing skins have begun to disappear. In Nunavut’s ‘igloo and email’ society, where adults who were born in igloos have children who may never have been out on the land, there’s a high incidence of depression.
答案：Heading: Negative effects on well-being（段落第一句为段落主题句，其中while引导的从句表示让步，起承上作用，后面的主句there has certainly been an impact on people’s health为本段的中心所在）