如图分别表示人体免疫的两种免疫过程,结合图示分析下列说法正确的是( )
A:两幅图均表示保卫人体的第一道防线
B:图一中的分泌物有杀菌作用,是保卫人体的第二道防线
C:图二中的溶菌酶能使病毒失活,是保卫人体的第三道防线
D:两幅图均不针对特定的病原体,都属于非特异性免疫
根据短文理解,选择正确答案。
Brave
Type: 3D cartoon Comedy Running time: 95 minutes
Merida, a princess, refused to marry a person that she dislikes. This causes trouble for her family and the whole country. Merida turns to a witch(女巫) for help. In doing so, her family and the country are in danger. Merida must save her family and the country before it is too late. X K b1.Com
The Grey
Type: Action Running time: 117 minutes
The Grey is based on the short story “Ghost Walker” written by Ian Mackenzie Jeffers. It's about a number of oil men who are in trouble in Alaska after a plane crash(空难). They have to fight against grey wolves that threaten(威胁) their lives.
Mirror Mirror
Type: comedy Running time: 106 minutes
You must know the story of Snow White. Would you like to see this story again? Come to see Mirror Mirror. It's a comedy about Snow White. Lily Collins and Julia Roberts are the main actresses in this interesting movie.
Chimpanzee
Type: Documentary Running time: 78 minutes
This movie is directed by Alastair Fothergill and Mark Linfield. It's a 2012 nature documentary film about a young chimpanzee named Oscar. He is alone in the African forests until he is raised by another chimpanzee. The chimpanzee takes care of Oscar like his own child.
纤维素被称为第七营养素.食物中的纤维素虽然不能为人体提供能量,但能促进肠道蠕动、吸附排出有害物质.从纤维素的化学成分看,它是一种( )