From the perspective of the CPU hardware model, which of the following are definitely not the basic components of the CPU（）
ALU
B. Main memory
Cache
D. Controller
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Where do T cells mature in（）
A. Spleen
B. Lymph nodes
C. Lymph tissue
D. Bone marrow
E. Thymus
The functions of thymus include（）
A. Is the site of T cell maturation
B. Is the site that T and B cells reside in
C. Is the site of immune response to antigens
D. Possesses the function of Immune regulation
E. Filtering blood
Which organs are central immune organs（）
A. Spleen
B. Lymph nodes
C. Lymph tissue
D. Thymus
E. Bone marrow
What part of lymph nodes do B cells reside in（）
A. Lymphoid follicle
B. peripheral lymphoid sheaths
C. Paracortex
D. Cellular cords
E. Central arterial
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