第15题: [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. He wanted Cathy to come, but she couldn’t. B. He invited Cathy to the party. C. He didn’t invite Cathy to the party. D. He couldn’t invite Cathy because he was not the holder. 参考答案:C 答案解析:[听力原文]
W: Robie booked a table for eight. I think Robie should have invited Cathy to the dinner par
第31题: [单项选择]口腔非特异性免疫系统不包括() A. 口腔黏膜 B. 唾液、龈沟液 C. 免疫活性细胞 D. 细胞、细胞因子及补体 E. 口腔正常菌丛 参考答案:C 答案解析:口腔非特异性免疫系统是由物理屏障、化学屏障、各种细胞及其产生的细胞因子及生物学屏障组成,口腔黏膜属于物理屏障,唾液、龈沟液是化学屏障,口腔正常菌丛有生物屏障作用,而免疫活性细胞即抗原特异性淋巴细胞,是