一位社会学家对两组青少年作了研究。第一组成员每周看暴力内容影视的时间平均不少于10个小时;第二组则不多于2小时，结果发现第一组成员中举止粗鲁者所占的比例要远比第二组高。因此，此项研究认为，多看暴力内容的影视容易导致青少年举止粗鲁。以下哪项为真，将对上述研究的结论提出质疑?

here has been a great increase in retail sales , ____ ﹖

中华民国临时约法的革命性与民主性表现在（）。

We need a more capable leader, ______ with strong will and as well as good humour.

"______ the friendship between our two people last forever!", and with this sincere hope, the president concluded his speech.