Tham khảo tài liệu 'level b lesson 25', ngoại ngữ, chứng chỉ a, b, c phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Level B lesson 25 Posted in January 14th 2009 by admin in English Test Level B 1. No one has been able to satisfactorily explain how or .the Moon sporadically sparks. B u A. when u B. why u C. what u D. which 2. The basic fiber-optics system is called a fiberscope .consists of two bundles of fibers. A u A. which u B. in which u C. where u D. what 3. Physicians can look into the lungs heart and other areas that were them. D u A. accessibly u B. access u C. accessible u D. inaccessible highly individual conceptions of music and chaos John Cage became a leading figure in avant-garde music. B u A. Such was u B. Due to u C. Because from D. .