该患者最可能患哪种疾病

A．运动神经元病

B．重症肌无力

C．急性脊髓炎

D．脊髓压迫症

E．吉兰-巴雷综合征

I'm told that you are going to Canada to have a threemonth further study. Don't let such a good chance

to improve your English ________ through your fingers. [ ]

A. ski  

B. spread

C. slip  

D. skip