1. Which one of the following bacterial components can be recognized by TLRs (Toll-like receptors) to induce tolerance?
(A) LPS (endotoxin)
(B) Peptidoglycan
(C) Teichoic acid
(D) All of the above
Ans：(D)
2. Which statement is NOT true regarding to the model of asphalt theory in the development of atopic diseases?
(A) Increasing coverage of soil by asphalt/concrete
(B) Impaired development/function of inducible Treg cells
(C) Recurrent/persistent exposure to soil micro-organisms reduced
(D) Increased IL-10/TGF-β production from innate cells
Ans：(D)
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