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.

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.

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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 短文第二段前两句指出“没有人能确定是什么原因引起了这种神经细胞的损坏，但是科学家们正在为找到答案而进行大量的研究”，故选F。
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