Using the information in the text, complete each sentence 14-18 with an expression from the list below. For each sentence(14

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问题     Using the information in the text, complete each sentence 14-18 with an expression from the list below.
    For each sentence(14-18), mark one letter(A-G)on your Answer Sheet.
    Do not mark any letter twice.
    A. chronic pain
    B. brain chemical
    C. nerve receptors
    D. a clear definition
    E. damaged nerves
    F. painkilling therapies
    G. an emotional response
Study on animals may finally discover some new ______ for human beings.

选项

答案F

解析
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