30×23=____
84×0+27=____
(85-85)×26=____
She found ____ difficult to settle and calm down in the ____ place, because she was worried about whether they would be discovered.
美丽的蝴蝶是由“毛毛虫”变成的,在昆虫的生殖和发育过程中,“毛毛虫”是( )
图甲是某地气温和降水量月份分配图,图乙中与此气候类型相对应的地区是( )
下列关于生物和生物圈的叙述,错误的是( )