A:set aside
B:set out
C:set back
D:set u
草地上有白兔9只,跑了4只,现在草地上有兔几只?
(只)
答:现在草地上有兔 只。
施用钾肥能增强农作物的抗倒伏能力.下列物质可用作钾肥的是
Mother came into my study with a cup of milk in one of her hands, and an apple in ______.