You had better _________ wine because you have to drive back home.
A:not drink
B:don't drink
C:not to drink
D:won't drink
图中长方形代表亚欧大陆,圆形代表中国,能正确反映中国位置的是( )
昆虫的发育经过____、幼虫____、成虫四个时期,幼虫的____和____与成虫不相同,这样的发育过程称为完全变态发育。
根据分式的基本性质,分式-aa-b可变形为( )