—All right.
A：dry
B：wet
C：hurt
D：warm
写出反义词
前进—____ 成功—____ 高空—____
—That must be Mr. John.
—No, it ________ be him. I saw him off at the airport half an hour ago.
动物细胞融合过程中所用的诱导剂——灭活的病毒，抗原性和感染力的有无是( )
