— Children today find it hard to focus on study.
— Exactly, as they ________ so many fun things to do.
A:found
B:have found
C:had found
D:will find
________are in the same class. We are good friends.
阅读图文资料,回答问题。
左图为山东济南和烟台苹果开花至苹果成熟对应的气温图,右图为山东半岛示意图。
下列关于脂质在生命活动中的作用的叙述,错误的是 ( )
(甲、乙两只灯泡接在同一个电源上,在相等的时间内,电流通过甲灯所做的功比乙灯大,说明( )
如果347×81+21×925+472×19的计算结果等于A,那么,A的各位数字之和等于( )