A:唾液中含抗生素,有杀菌作用,属于非特异性免疫
B:唾液中含溶菌酶,有杀菌作用,属于特异性免疫
C:唾液中含溶菌酶,有杀菌作用,属于非特异性免疫
D:唾液中含唾液淀粉酶,有消化病菌的作用,属于特异性免疫
It's Sunday afternoon. Michael's family have a picnic under (在……下面) a big tree. The woman in a blue T-shirt and white pants is Michael's mother. ⑴She is thirty-two. She is a teacher in No. 2 high School. She is cooking now. The man with a guitar is Michael's father. He is thirty-four years old. ⑵He teaches in the same school as Michael's mother. He is a teacher. Michael's little sister likes singing, but she isn't singing now. ⑶“为什么不和我一起去放风筝呢?”Michael问他的小妹妹。⑷Then she flies a kite with her brother. What a happy family!