The immunity refers to the natural ability of the body to ()
A. Protect from certain diseases
B. Fight against specific disease
C. Remove old or dead cells
D. kill and remove pathogen
E. Recognize and remove antigens
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A characteristic of adaptive immunity is ()
A. Redness
B. Inflammation
C. Lack of specificity
D. Memory
E. All of the above
Humoral immunity refers to which of the following elements ()
Ab
B. Macrophages
Complement
D. A and C
E. All of the above
Cells participating in adaptive immunity are ()
A. NK cells
B. NKT cells
C. T cells
D. Macrophages
E. B-1 cells
关于循环的嵌套，说法不正确的是( )
A. 一个循环体内又包含另一个完整的循环结构,称为循环的嵌套
B. 内嵌的循环中可以再嵌套循环
C. while循环，do...while循环，for循环都可以互相嵌套
D. for循环的循环体不能再使用for循环
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