15. Great changes ______ in the city, and a lot of new buildings ______.

A．have been taken place; have been set up

B．have taken place; have been set up

C．have taken place; have set up

D．were taken place; were set up

QB/T1002-2005《皮鞋》中鞋帮拉出强度测试时，前帮连同鞋底横向切割宽度（）试条，内外侧各取一条，拉伸速度为（）。

A.10mm；50mm/min±5mm/min

B.10mm；25mm/min±2mm/min

C.20mm；50mm/min±5mm/min

D.20mm；25mm/min±2mm/min