①加强农业生产,增加粮食产量 ②缩短基本建设战线,保证重点工程
③在农村坚决纠正“共产”风 ④在城市精简职工,减少城镇人口
A:①②③④
B:①②③
C:②③④
D:①②④
用显微镜观察“人体口腔上皮细胞”临时装片,观察到甲、乙视野.下列叙述正确的是( )
下列诗句中,属于生物因素对生物影响的是( )
It was Sunday today. Tom with her two good friends are going to see his uncle . There are lots of apples trees on his uncle farm. But he is too busy to pick the apples in them. So Jim went to help him every year. The farm is no far from here. The children are all going there on bike . They think it's good for their healthy.