There are____styles in clothing. Some styles are____——they stay popular____a long time and never go____out of fashion. They may be enduring favourites for several ____, or even generations.

    ____other living things, people need nourishment to live. Food____the energy needed for____activities, from____ actions such as breathing and sleeping to more ____activities such as sports.

世界贸易组织总干事鲁杰罗指出，“阻止全球化无异于想阻止地球自转。”对于“全球化”的理解不正确的是

如果x=3，y=2是二元一次方程ax﹣by﹣5=0的一个解，则3a﹣2b﹣1=​____．

如图，⊙O的弦AB＝8，OE⊥AB于点E，且OE＝3，则⊙O的半径是 (          )