放射冠消失是受精卵着床的必备条件之一。
参考答案:错
6+7→( )- 5→( )+8→( )- 7→( )+5→( )
When you come here for your holiday next time, don’t go to _____ hotel; I can find you _______ bed in my flat.
A.the, a
B.the, /
C.a, the
D.a, /