Our charity show for three hours this afternoon. We were tired but very happy.
A:lasts
B:lasted
C:has lasted
D:will last
认真观察的消化系统结构图,看看下列有关叙述中有无错误,若有,请把错误的一项找出来( )
某生物兴趣小组为探究食品腐败的原因,设计了如下实验:取两个规格相同的烧瓶,同时灌入等量的肉汤,煮沸降温后进行持续观察.装置如图所示.预测实验的结果,可能性最大的是( )
____ to online communications, some students ____ ____ ____ ____ be buried in a virtual world.
①冬寒漫长 ②雨热同期 ③水源充足 ④沃野千里