下列公式中，齿数比前的正负号由G、K两轮在（）中的转向关系确定。
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Which one of the following is a prokaryote?
A. Bacteria
B. Algae
C. Protozoa
D. Fungi
E. Prion
Hypersensitivity reactions that involve antibodies include
A. Only type I hypersensitivity
B. Only type I and type II hypersensitivity
C. Type I, II, and III hypersensitivity
D. Type IV hypersensitivity
E. Type I and type IV hypersensitivity
The disease that is caused by type III hypersensitivity is
Atopic dermatitis
B. Goodpasture’s syndrome
C. Serum sickness
D. Allergic rhinitis
E. Autoimmune hemolytic anemia
The second signal molecules of B cell activation are mainly
A. CD40 and CD40L
B. CD8 and MHC class I molecules
CD4 and MHC class II molecules
D. CD28 and B7
E. BCR and CD79a/b
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