A. if there isn’t enough dopamine in your body B. what affects muscles all through your body C. which cannot be cured yet D. if

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问题 A. if there isn’t enough dopamine in your body
B. what affects muscles all through your body
C. which cannot be cured yet
D. if you have a fixed or blank expression
E. which may be the first symptom you notice
F. what causes Parkinson’s disease
A lot of research is being done to find out______.

选项

答案F

解析 人们正在进行大量的研究来发现导致帕金森综合征的原因。根据第二段前三句话及后面提到的“aging,poisons in environment”等可推断应选F。
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