—Where are my model planes, mom? —Sorry, I don't know. Oh, look, they are _________.
A:in the sofa
B:on the room
C:under the bed
D:at here
写出下列词语的反义词。
凌晨——____ 平凡——____ 普通——____
精子和卵细胞结合的场所是 ____ ;胚胎发育的场所是 ____。