2. 外语
  3. 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

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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