This ______ of culture between Europeans and the Romany led to many nations taking action against them, even banning Romany groups from entering.
A：collision
B：switch
C：surplus
D：dimension
一筐苹果，2个2个地拿，3个3个地拿，4个4个地拿，5个5个地拿都正好拿完没有余数，这筐苹果最少应有（ ）个．
腺鼠疫病原体是鼠疫杆菌，鼠疫杆菌释放外毒素，使患者出现中毒性休克综合征。从病愈患者的血清中提取的抗毒素对腺鼠疫患者有显著疗效。下列说法正确的是( )
下列关于酶的叙述错误的是（ ）
