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
As scientists don’t know much about pain, it’s hard to provide______of it.

选项

答案D

解析
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