在下列细胞中,借助抗原识别受体捕获抗原的细胞是()
A.吞噬细胞
B.树突状细胞
C.并指状细胞
D.郎格汉斯细胞
E.B细胞
参考答案:E
纵隔肿瘤、支气管癌引起咳嗽的特点是()。
A.咳嗽声音嘶哑
B.咳嗽声音低微或无声
C.犬吠样咳嗽
D.金属声咳嗽
E.以上都不是
To the parents' worry, some middle school students are ______ computer games and completely forget
their studies.[ ]
A. crazy about
B. very fond of
C. concerned for
D. serious about