Cross:杂交
参考答案:
不同纯合子之间的交配;产生一种基因型。
— Do you think we should put an ad in the paper for the lost child?
— Yes, ______.
A.that’s all right
B.by all means
C.it just depends
D.never mind
咽旁隙与下列哪些隙相邻,炎症可相互扩散()。
A.咽后隙
B.颌下隙
C.舌下隙
D.腮腺隙
E.颈动脉鞘