...if you want to "slow an epidemic, _____ hand-washing."[音频]（来源：VOA）
A. forget
B. concentrate on
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Which of the following molecular cytoplasmic regions contains ITAM?
A. CD2
B. CD3
CTLA-4
D. CD21
E. CD8
Which of the following cytokines is a Th1 cytokine?
A. IL-2
B. IL-3
C. IL-4
D. IL-5
E. IL-6
Which of the following cells is involved in the negative regulation of immune response?
A. Th1
B. Th2
C. Tfh
D. Th17
E. Treg
Which of the following statements about γδT cells is wrong?
A. Its antigen receptor lacks diversity.
B. Recognition of antigens is restricted by MHC.
C. It is mainly distributed in skin and mucosa.
D. It has anti infection and anti-tumor effects.
E. Most of them are CD4(-)CD8(-)。
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