翻译：麋何食兮庭中？

Daniel likes ______ basketball, but he ______ at home right now. [ ]

A. plays; is sleeping

B. playing; sleeps

C. playing; sleep  

D. playing; is sleeping

对明文字母重新排列，并不隐藏的加密方法属于( )。

A．置换密码

B．分组密码

C．易位密码

D．序列密码

I cannot______ puzzled，for I simply cannot understand how I could have made such a stupid mistake.

A．help feel

B．help but to feel

C．but to feel

D．but feel

所谓社会科学数学化就是指数学向（）的渗透，运用数学方法来揭示（）的一般规律。

电器设备过电压是指超过额定电压（）以上。

A.10﹪

B.12﹪

C.15﹪

D.17﹪