29. According to the passage, which of the following is true about Cromolyn?
(A) It is a newly developed drug.
(B) It is not advertised on television because its safety has not been proven.
(C) It prevents the release of chemicals such as histamine from the mast cells.
(D) It is more expensive than oral antihistamines and nasal steroids.
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統計: A(10), B(4), C(41), D(4), E(0) #3056754
統計: A(10), B(4), C(41), D(4), E(0) #3056754