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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