患者，女，50岁，诉颈肩部疼痛4天，伴左上肢麻木。查体示颈部活动受限，颈椎局部压痛明显，前屈旋颈试验阳性，神经根试验阳性，转头加力试验阳性，左手桡侧感觉略减退，双侧肱二头肌和肱三头肌反射正常对称。X线片示C_4-7椎间隙略窄。

对明确病因最有价值的检查项目是（）。

A.X线平片

B.MRI

C.超声

D.神经传导速度检查

E.肌电图检查

按要求改写句子。

1. I have a fever. (对划线部分提问 )

    __________ the __________ you?

2. Mrs Brown has a rest every five minutes. (同上)

    __________ does Mrs Brown have a rest? 

3. Please open your books. (改为否定句)

     __________ your books, __________.

4. She shouldn't eat anything for 24 hours. (改为肯定句)

    She __________ eat __________ for 24 hours.

5. Nancy had a cold yesterday. (改为同义句)

    Nancy __________ yesterday.

6. She has a stomachache and a headache. (改为否定句）

   She ___________ a stomachache __________ a headache.